Updated on 2024/12/14

写真a

 
INAGAKI Katsuhiko
 
Organization
School of Medicine General Education Physics
External link

Degree

  • 博士(工学) ( 北海道大学 )

Research Interests

  • 固体物理

  • Solid State Physics

  • 低次元電子物性

  • Low Dimensional Electron Properties

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

Professional Memberships

Papers

  • Quantum Time Sliding by CDW Instantons in Nanoscale NbS<sub>3</sub> and TaS<sub>3</sub>

    Yuta Fukuda, Kazu Urushihara, Akiya Sean Ebana, Hiroyoshi Nobukane, Katsuhiko Inagaki, Satoshi Tanda

    Proceedings of the 29th International Conference on Low Temperature Physics (LT29)   2023.5

     More details

    Publishing type:Research paper (international conference proceedings)   Publisher:Journal of the Physical Society of Japan  

    DOI: 10.7566/jpscp.38.011181

    researchmap

  • Lock-in transition of charge density waves in quasi-one-dimensional conductors: Reinterpretation of McMillan's theory

    Katsuhiko Inagaki, Satoshi Tanda

    Physical Review B   97 ( 11 )   2018.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society  

    We investigated the lock-in transition of charge density waves (CDWs) in quasi-one-dimensional conductors, based on McMillan's free energy. The higher-order umklapp terms play an essential role in this study. McMillan's theory was extended by Nakanishi and Shiba to treat multiple CDW vectors. Although their theories were aimed at understanding CDWs in quasi-two-dimensional conductors, we applied them to the quasi-one-dimensional conductors, including K0.3MoO3, NbSe3, and m-TaS3, and confirmed its validity for these cases. Then we discussed our previous experimental result of o-TaS3, which revealed the coexistence of commensurate and incommensurate states. We found that the coexistence of multiple CDW vectors is essential for the lock-in transition to occur in o-TaS3. The even- and odd-order terms in the free energy play roles for amplitude development and phase modulation, respectively. Moreover, consideration of the condition of being commensurate CDWs allowed us to relate it with that of the weak localization in random media.

    DOI: 10.1103/PhysRevB.97.115432

    Scopus

    arXiv

    researchmap

  • Anisotropic magnetoresistance in quasi-one dimensional conductor o-TaS<sub>3</sub>, II

    Inagaki K., Matsuura T., Tsubota M., Uji S., Honma T., Tanda S.

    Meeting Abstracts of the Physical Society of Japan   72 ( 0 )   1731 - 1731   2017

     More details

    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.72.1.0_1731

    researchmap

  • Melted discommensuration of charge density waves Reviewed

    T. Matsuura, J. Hara, K. Inagaki, M. Tsubota, T. Hosokawa, S. Tanda

    PHYSICA B-CONDENSED MATTER   460   30 - 33   2015.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    We investigate the charge density wave transport on the quasi one-dimensional system, orthorhombic tantalum trisulfide (o-TaS3), by applying a radio-frequency ac voltage. New ac-dc interference spectrum is observed in the differential conductance, which appears at both sides of the zero-bias peak. The frequency and amplitude dependences of the new spectrum do not correspond to those orally conventional ac-dc interference spectrum, namely integer and fractional Shapiro steps. The results suggest that there are unconventional internal degrees of freedom in the CDW. We propose that randomly distributed 2 pi phase solitons contribute electrical conduction when both ac and dc voltages are applied. Our results provide a new insight for a general understanding of CDW dynamics. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2014.11.034

    Web of Science

    researchmap

  • Charge density wave soliton liquid Reviewed

    T. Matsuura, J. Hara, K. Inagaki, M. Tsubota, T. Hosokawa, S. Tanda

    EPL   109 ( 2 )   2015.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY  

    We investigate the charge density wave transport in a quasi-one-dimensional conductor, orthorhombic tantalum trisulfide (o-TaS3), by applying a radio-frequency ac voltage. We find a new ac-dc interference spectrum in the differential conductance, which appears on both sides of the zero-bias peak. The frequency and amplitude dependences of the new spectrum do not correspond to those of any usual ac-dc interference spectrum (Shapiro steps). The results suggest that CDW phase dynamics has a hidden degree of freedom. We propose a model in which 2 pi phase solitons behave as liquid. The origin of the new spectrum is that the solitons are depinned from impurity potentials assisted by an ac field when a small dc field is applied. Our results provide a new insight as regards our understanding of an elementary process in CDW dynamics. Copyright (C) EPLA, 2015

    DOI: 10.1209/0295-5075/109/27005

    Web of Science

    researchmap

  • 22aCT-2 Charge Density wave soliton liquid

    Matsuura T., Hara J., Inagaki K., Tsubota M., Hosokawa T., Tanda S.

    Meeting Abstracts of the Physical Society of Japan   70   1677 - 1677   2015

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.1.0_1677

    CiNii Books

    researchmap

  • 22aCT-3 Anisotropic magnetoresistance in quasi-one dimensional conductor o-TaS_3

    Inagaki K., Matsuura T., Tsubota M., Uji S., Honma T., Tanda S.

    Meeting Abstracts of the Physical Society of Japan   70   1678 - 1678   2015

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.1.0_1678

    CiNii Books

    researchmap

  • Aharonov-Bohm effect in charge-density wave loops with inherent temporal current switching Reviewed

    M. Tsubota, K. Inagaki, T. Matsuura, S. Tanda

    EPL   97 ( 5 )   2012.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY  

    We report evidence for Aharonov-Bohm (AB) oscillations with temporal current switching at 5.1 and 79K by using charge-density wave (CDW) loops in TaS3 ring crystals. The periodicity of the AB oscillations is h/2e, and this is confirmed by employing four samples with different diameters. This means that sliding CDWs carry 2e charge quanta. We observe current switching between the two states, namely the high and low current states, as a result of the separation of field-dependent and time-dependent fluctuations. The probability distribution of the switching oscillates also with a period of h/2e. We discover that the observed oscillations, which are a superposition of the current fluctuations and the switching behavior, have a period h/2e. Copyright (C) EPLA, 2012

    DOI: 10.1209/0295-5075/97/57011

    Web of Science

    researchmap

  • Polyhedral Topological Crystals

    Masakatsu Tsubota, Katsuhiko Inagaki, Toru Matsuura, Satoshi Tanda

    CRYSTAL GROWTH & DESIGN   11 ( 11 )   4789 - 4793   2011.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    We have synthesized micrometer-scale polyhedral ring crystals of TaS(3) by the; chemical vapor transportation method. The polyhedral ring crystals are closed-loop crystals with several vertices. We investigated the crystallinity and flatness of the facets by the electron backscatter diffraction technique and found that the orientation of the crystal axis changed abruptly at several points. Observing the size of the crystals, we found a new phase of topological crystals and propose a phase diagram of ring-polyhedral crystals in terms of radius and thickness. We also propose a mechanism of polygonization in which the vertices of the polyhedral crystals are formed from concentrated dislocations as a result of distance-dependent interactions between them.

    DOI: 10.1021/cg2004003

    Web of Science

    J-GLOBAL

    researchmap

  • Parity-violating current-voltage curves in a single domain of Sr2RuO4 superconductors

    H. Nobukane, K. Inagaki, K. Ichimura, K. Yamaya, S. Takayanagi, I. Kawasaki, K. Tenya, H. Amitsuka, K. Konno, Y. Asano, S. Tanda

    PHYSICA B-CONDENSED MATTER   405 ( 11 )   S277 - S278   2010.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    We have found parity-violating current-voltage (I-V) curves in a single domain of Sr2RuO4 superconductors The Induced voltage V is an even function of bias current I below superconducting transition temperature The anomalous I-V curves show that positive voltage is detected regardless of the current direction The result implies the parity violation of I-V curves (C) 2009 Elsevier B V All rights reserved

    DOI: 10.1016/j.physb.2009.11.101

    Web of Science

    researchmap

  • Topological effects of the superconducting vortex state in a TaSe3 ring crystal: Observation of magnetic torque oscillations Reviewed

    Kumagai Genki, Matsuura Toru, Ichimura Koichi, Yamaya Kazuhiko, Inagaki Katsuhiko, Tanda Satoshi

    PHYSICAL REVIEW B   81 ( 18 )   184506   2010.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society  

    We measured the magnetic torque of the ring-shaped crystals of TaSe3 by using piezoresistive cantilevers to investigate the superconducting topological properties. We measured three ring samples and we observed that the magnetic torque of the ring crystals oscillates with increasing external magnetic field. The magnetic periods of Sample A (radius: 37.9 mu m), Sample B (24.5 mu m), and Sample C (15.6 mu m) were 2.16 +/- 6.6 x 10(-2) G, 4.69 +/- 1.8 x 10(-1) G, and 5.44 +/- 3.8 x 10(-1) G, respectively. We found that hundreds of vortices collectively and simultaneously penetrated the ring crystal. When such a phenomenon occurs, it is natural that the vortices in the ring crystal would be positioned along the circumference. From these results, we suggest that vortices exist as cylinder vortices in the rings, and this phenomenon provides unambiguous experimental evidence of the topological effect in a superconductor.

    DOI: 10.1103/PhysRevB.81.184506

    Web of Science

    researchmap

  • Nonlocal transport in the charge density waves of o-TaS3

    Katsuhiko Inagaki, Masakatsu Tsubota, Satoshi Tanda

    PHYSICAL REVIEW B   81 ( 11 )   2010.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    We studied the nonlocal transport of a quasi-one-dimensional conductor o-TaS3. Electric transport phenomena in charge density waves include the thermally excited quasiparticles and collective motion of charge density waves (CDWs). In spite of its long-range correlation, the collective motion of a CDW does not extend far beyond the electrodes, where phase slippage breaks the correlation. We found that nonlocal voltages appeared in the CDW of o-TaS3, both below and above the threshold field for CDW sliding. The temperature dependence of the nonlocal voltage suggests that the observed nonlocal voltage originates from the CDW even below the threshold field. Moreover, our observation of nonlocal voltages in both the pinned and sliding states reveals the existence of a carrier with long-range correlation, in addition to sliding CDWs and thermally excited quasiparticles.

    DOI: 10.1103/PhysRevB.81.113101

    Web of Science

    arXiv

    researchmap

  • Transport Properties in a Single Domain of Microscale Sr2RuO4 Single Crystals

    Hiroyoshi Nobukane, Katsuhiko Inagaki, Satoshi Tsuchiya, Yasuhiro Asano, Koichi Ichimura, Kazuhiko Yamaya, Shigeru Takayanagi, Ikuto Kawasaki, Kenichi Tenya, Hiroshi Amitsuka, Satoshi Tanda

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 2 )   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC APPLIED PHYSICS  

    We report our approach to measuring the transport properties in a single chiral order parameter domain of microscale Sr2RuO4 single crystals. Sr2RuO4 single crystals were grown by the solid-phase reaction. Microscale single crystals were deposited from a dispersed liquid, and selected from the result of the chemical composition and crystallinity of the dispersed crystals. The selected crystals attached to gold electrodes show superconducting properties. We also found the anomalous current-voltage characteristics that show that induced voltage is an even function of bias current. (C) 2010 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.49.020209

    Web of Science

    researchmap

  • Nonlocal transport in the charge density waves of $o$-TaS$_3$

    Katsuhiko Inagaki, Masakatsu Tsubota, Satoshi Tanda

    Phys Rev B Condens Matter Mater Phys   81 ( 11 )   113101.1-113101.4   2009.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    We studied the nonlocal transport of a quasi-one dimensional conductor<br />
    $o$-TaS$_3$. Electric transport phenomena in charge density waves include the<br />
    thermally-excited quasiparticles, and collective motion of charge density waves<br />
    (CDW). In spite of its long-range correlation, the collective motion of a CDW<br />
    does not extend far beyond the electrodes, where phase slippage breaks the<br />
    correlation. We found that nonlocal voltages appeared in the CDW of<br />
    $o$-TaS$_3$, both below and above the threshold field for CDW sliding. The<br />
    temperature dependence of the nonlocal voltage suggests that the observed<br />
    nonlocal voltage originates from the CDW even below the threshold field.<br />
    Moreover, our observation of nonlocal voltages in both the pinned and sliding<br />
    states reveals the existence of a carrier with long-range correlation, in<br />
    addition to sliding CDWs and thermally-excited quasiparticles.

    DOI: 10.1103/PhysRevB.81.113101

    arXiv

    J-GLOBAL

    researchmap

  • Duality breaking of vortex configuration in a hierarchical honeycomb network

    S. Tsuchiya, T. Toshima, H. Nobukane, K. Inagaki, S. Tanda

    PHYSICAL REVIEW B   80 ( 9 )   2009.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    We report measurements of Little-Parks oscillation on the hierarchical honeycomb-superconducting network for investigating possible effects of hierarchical structure in terms of spatial symmetry, parity, and duality. We observed an asymmetric Little-Parks oscillation about Phi/Phi(0)=1/2, although spatial symmetry was kept in the network. In comparison with a regular honeycomb network, the asymmetric oscillation is attributed to hierarchy which induces mixture of commensurate and incommensurate regions. The asymmetric oscillation is found to indicate breaking of the duality of vortex configuration.

    DOI: 10.1103/PhysRevB.80.094502

    Web of Science

    Scopus

    researchmap

  • Parity violation in a single domain of spin-triplet Sr2RuO4 superconductors

    Nobukane H., Inagaki K., Ichimura K., Yamaya K., Takayanagi S., Kawasaki I., Tenya K., Amitsuka H., Konno K., Asano Y., Tanda S.

    Solid State Communications   149 ( 29 )   1212 - 1215   2009.8

     More details

    Language:English   Publisher:Elsevier Ltd.  

    DOI: 10.1016/j.ssc.2009.04.022

    researchmap

  • Quantum interference of charge-density waves: Evidence for topological crystals of TaS3 Reviewed

    M. Tsubota, K. Inagaki, S. Tanda

    PHYSICA B-CONDENSED MATTER   404 ( 3-4 )   416 - 418   2009.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    We investigated Aharonov-Bohm (AB) oscillations from charge-density waves (CDWs) in TaS3 ring crystals and demonstrated that only sliding CDWs behave as a macroscopic quantum plane wave coupled to magnetic fields. The periodicity of the oscillations is h/2e within 10% accuracy. This means that sliding CDWs carry 2e charge quanta and that cannot be explained by quasi-particle interference. This is the first unambiguous experimental evidence for the AB effect in CDW loops. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2008.11.066

    Web of Science

    researchmap

  • Commensurate-incommensurate urate transition of charge density waves in o-TaS3 Reviewed

    K. Inagaki, M. Tsubota, K. Ichimura, S. Tanda, K. Yamamoto, N. Hanasaki, Y. Nogami, N. Ikeda, T. Ito, H. Toyokawa

    PHYSICA B-CONDENSED MATTER   404 ( 3-4 )   396 - 398   2009.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    We report a synchrotron X-ray study of charge density waves (CDWs) in an o-TaS3 crystal. CDW of o-TaS3 has been known to undergo a commensurate-incommensurate transition at 100 K, below which the wavevector locks in with the pristine lattice. However, the details of the commensurate-incommensurate transition remain open problems, the example being whether the discommensuration exists or not in the neighborhood of the transition. We exploited the beamline BL02B1 of SPring-8. A two-dimensional detector was placed at a distance of 1300mm from the sample, providing an angle resolution of 0.0076 degrees. Temperature dependence of the Bragg peak (0 0 2) and satellite peak (1 - 12) + q was measured from 7 to 180 K. We found that a new phase in the temperature range of 130-50 K, where two independent CDWs coexist. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors q(c) = 0.252c* and 0.250c*, respectively. By lowering the temperature, intensity of the incommensurate CDW was decreased, while that of the commensurate CDW was increased. Below 50K, the incommensurate CDW was completely diminished. Based on the concept of discommensuration, we suggested the dislocation configuration from the intensity of the two CDWs. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2008.11.017

    Web of Science

    researchmap

  • Little-Parks Oscillation in a Hierarchical Superconducting Network Reviewed

    S. Tsuchiya, T. Toshima, H. Nobukane, K. Inagaki, S. Tanda

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 2   150   2009

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    We have investigated Little-Parks oscillation in a hierarchical superconducting network for searching possible effects of hierarchical structure in terms of spatial symmetry, parity and duality. We prepared a hierarchical honeycomb network, which is obtained to gather 6 hexagons around a hexagon and add 6 rhombuses to large hexagon repeatedly, by standard electron beam lithography and measured variation of superconducting transition temperature (T(c)) in a magnetic field. For comparison, we also fabricated regular honeycomb network and measured variation of T(c). The filling ratio f = Phi/Phi(0) is the magnetic flux Phi in units of the flux quantum Phi(0) per elementary hexagon. Downward cusps in T(c) curves of the regular honeycomb network are observed at f = 1/3, 2/5, 1/3, 3/5, 2/3. This result in range of 0 to 1 is symmetric about f = 1/2 and reminiscent of the report in the recent years. On the other hand, that of the hierarchical honeycomb network are observed at f = 1/5, 3/10, 4/9, 1/2, 5/9, 7/10, 3/4. The cusps at f = 1/5, 3/4 are not symmetric about f = 1/2. It is indicated that duality of vortex configuration on the network break down although system has symmetric structure. This behavior was not even obtained in the case of Sierpinski gasket, which is deterministic fractal form. Therefore this anti-symmetric pattern is due to the effect of hierarchical honeycomb structure in itself.

    DOI: 10.1088/1742-6596/150/2/022089

    Web of Science

    researchmap

  • Magnetic Rapid Quench Measurement in U(1) and SU(2) superconductors

    H. Nobukane, S. Tsuchiya, K. Konno, K. Inagaki, S. Tanda, I. Kawasaki, H. Amitsuka, K. Tenya, Y. Maeno

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 5   150   052187-1-052187-4   2009

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    We observed the power law and the critical exponent of quantum phase transitions by measuring a transient response in an Al/AlOx/Al junction of U(1) superconductors and Sr2RuO4 single crystals of SU(2) superconductors, when magnetic field decreased rapidly from more than the critical field to zero magnetic field below T = 0.1 K. In the Al/AlOx/Al junction, the result shows that the domain length xi is a power function of the quench time tau(Q). The critical exponent is 0.30 +/- 0.01. Moreover, in the Sr2RuO4 crystal, the result shows xi is a power function of tau(Q) and the critical exponent is 0.40 +/- 0.01. From the results of U(1) and SU(2) superconductors, we consider the critical exponents observed by the quenching are derived by a mean-field value in charged systems. Using typical U(1) and SU(2) superconductors, we find that the magnetic quench is efficient method to study formation processes of topological defects for a quantum phase transition near T = 0.
    http://iopscience.iop.org/article/10.1088/1742-6596/150/5/052187/pdf

    DOI: 10.1088/1742-6596/150/5/052187

    Web of Science

    researchmap

  • Synchrotron X-ray study of charge density waves in o-TaS3 Reviewed

    K. Inagaki, M. Tsubota, K. Ichimura, S. Tanda, K. Yamamoto, N. Hanasaki, Y. Nogami, N. Ikeda, T. Ito, H. Toyokawa

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4   150   2009

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    We report a synchrotron X-ray study of charge density waves (CDW) in an o-TaS3 crystal. CDW of o-TaS3 has been known to undergo a commensurate-incommensurate transition at 100 K, below which the wavevector locks in with the pristine lattice. We exploited the beamline BL02B1 of SPring-8. Temperature dependence of the Bragg peak (002) and satellite peak (1 -1 2)+(q) over right arrow was measured from 7 K to 180 K. We found that a new phase in a temperature range of 130-50 K, where two independent CDWs coexist. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors q(c)=0.252c* and 0.250c*, respectively. By lowering the temperature, intensity of the incommensurate CDW was decreased, while that of the commensurate CDW was increased. At 50 K, the incommensurate CDW was completely diminished. Based on the concept of discommensuration, we determined the dislocation configuration from the intensity of the two CDWs.

    DOI: 10.1088/1742-6596/150/4/042068

    Web of Science

    researchmap

  • Superconducting Gap and Pseudogap Structure in LaFeAsO1-xFx Probed by STM/STS Reviewed

    Koichi Ichimura, Junya Ishioka, Toru Kurosawa, Katsuhiko Inagaki, Migaku Oda, Satoshi Tanda, Hiroki Takahashi, Hironari Okada, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77   151 - 152   2008.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    We report the electron tunneling study on LaFeAsO1-xFx (x=0.07) using low temperature UHV-STM/STS. Tunneling spectra below T-c clearly shows the gap structure. We found three anomalies as kinks in the tunneling differential conductance curve: 1) Superconducting gap structure Delta(SC)=6 meV. 2) Small pseudogap Delta(PGS)=20 meV. 3) Large pseudogap Delta(PGL)=100-150 meV. Corresponding value of 2 Delta(SC)/k(B)T(c)=5.8 suggests strong coupling superconductivity. Tunneling spectra at T=80 K show dip structure. The kink around V=150 mV still exist.

    Web of Science

    researchmap

  • Observation of quantum fluctuation in nano Sr(2)RuO(4) p-wave superconductors Reviewed

    H. Nobukane, K. Inagaki, K. Ichimura, S. Takayanagi, K. Yamaya, S. Tanda

    INTERNATIONAL CONFERENCE ON THEORETICAL PHYSICS &apos;DUBNA-NANO2008&apos;   129   012922-1 - 012022-4   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    We observed quantum fluctuations of the superconducting phase ? in single domain Sr(2)RuO(4) single crystals using a transport measurement. The temperature dependence of the resistivity of submicron Sr2(R)uO(4) shows that a finite resistivity below the superconducting transition temperature of T(c) = 1.69 K. The results may suggest that the finite resistivity is occurred by the flow of vortices due to quantum fluctuations of the superconducting phase theta in the same way as one-dimensional Josephson junction array systems

    DOI: 10.1088/1742-6596/129/1/012022

    Web of Science

    researchmap

  • Charge density wave circulating current in NbSe(3) rings observed by measuring Shapiro interference Reviewed

    Toru Matsuura, Katsuhiko Inagaki, Satoshi Tanda

    INTERNATIONAL CONFERENCE ON THEORETICAL PHYSICS &apos;DUBNA-NANO2008&apos;   129   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    We investigate topological effect of charge density wave (CDW). The Shapiro step measurement was performed on NbSe(3) topological (ring) crystals. We found that a beat-like splitting of Shapiro step spectrum. These results suggest that the circulating CDW current flows in the ring, and modifies the CDW fundamental frequency, namely narrow-band-noise frequency.

    DOI: 10.1088/1742-6596/129/1/012024

    Web of Science

    researchmap

  • TOPOLOGICAL EFFECTS IN CHARGE DENSITY WAVE DYNAMICS Reviewed

    Toru Matsuura, Katsuhiko Inagaki, Satoshi Tanda, Taku Tsuneta

    CONTROLLABLE QUANTUM STATES: MESOSCOPIC SUPERCONDUCTIVITY AND SPRINTRONICS   377 - +   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We investigate charge density wave (CDW) dynamics in ring-shaped crystals of NbSe3. We performed a measurement of the frequency dependence of resistance for a closed-ring topology (ring-shaped crystal without edge) and an open-ring topology (cut ring-shaped crystal with two edges) in the 300 kHz to 1.3 GHz frequency range. Comparison of the frequency dependence of the resistance indicated that the pinning potential in the closed-ring topology was smaller than that in the open-ring topology. This result suggests existence of a CDW circulating current in NbSe3 ring-shaped crystals.

    DOI: 10.1142/9789812814623_0060

    Web of Science

    researchmap

  • STUDIES ON NANOSCALE CHARGE-DENSITY-WAVE SYSTEMS: FABRICATION TECHNIQUE AND TRANSPORT PHENOMENA Reviewed

    Katsuhiko Inagaki, Satoshi Tanda

    CONTROLLABLE QUANTUM STATES: MESOSCOPIC SUPERCONDUCTIVITY AND SPRINTRONICS   383 - 388   2008

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We report studies of o-TaS(3) nanocrystals, including sample preparation of nanocrystals, fabrication of electrodes attached to the nanocrystals, and transport properties. Since the correlation length of a charge density wave (CDW) is in the range of several microns, electric properties of CDW in nanocrystals are expected to show significant difference. We have developed a new fabrication technique for electrodes by annealing with electron beam to reduce the contact resistance significantly. We applied this technique for the study of nanoscale CDW systems. Temperature dependence of resistance was measured in a o-TaS(3) nanocrystal with the electrode distance of several mu m. The observed resistance did not show a clear Peierls transition. The resistance was well described in terms of one-dimensional (1D) variable-range-hopping (VRH) conduction over the wide range of temperature. These behaviors are consistent with those of the previously reported nanoscale CDW systems. We also found a finite-size effect in current-voltage characteristics in nanoscale o-TaS(3) crystals with various sample dimensions. These results are consistent with the idea that electric transport phenomenon of the nanoscale o-TaS(3) crystals should be attributed to charged solitons in commensurate CDW systems.

    Web of Science

    researchmap

  • Charge density wave dynamics on ring Reviewed

    Toru Matsuura, Taku Tsuneta, Katsuhiko Inagaki, Satoshi Tanda

    LOW TEMPERATURE PHYSICS, PTS A AND B   850   1528 - +   2006

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:AMER INST PHYSICS  

    We have studied a topological effect of a charge density wave (CDW) in niobium triselenide ring crystals. We measured the frequency dependence of AC conductivity in the range from 300 kHz to 1.3 GHz to investigate the dynamics of the CDW ring. We compared the dynamical properties of the CDW in the ring and in the cut-ring geometries. The experimental data shows that the pinning frequency of the cut-ring is larger than that of the ring. This result suggests that the dynamics of the CDW depend on the edges, i.e., the topological structure of the sample.

    Web of Science

    researchmap

  • Charge density wave and pressure-induced reentrant superconductivity in ZrTe3 Reviewed

    K Yamaya, R Yomo, K Inagaki, S Tanda, M Abliz, M Hedo, Y Uwatoko

    JOURNAL DE PHYSIQUE IV   131   343 - 345   2005.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:EDP SCIENCES S A  

    We have investigated the pressure effects near the phase boundary between the CDW and the pressure-induced reentrant-superconductivity (r-SC) in ZrTe3, where, simultaneously with the collapse of the CDW state, appears again the SC. Fluctuations of the CDW and the SC have become stronger as both transitions approach to the phase boundary. We discuss the possible exsitence of a novel state between the CDW and the r-SC phases.

    DOI: 10.1051/jp4:2005131087

    Web of Science

    researchmap

  • New crystal topologies and the charge-density-wave in NbSe3 Reviewed

    T Tsuneta, S Tanda, K Inagaki, Y Okajima, K Yamaya

    PHYSICA B-CONDENSED MATTER   329   1544 - 1545   2003.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    We successfully synthesized new crystal forms of a charge-density-wave conductor, NbSe3. The new forms are basically a loop of diameters 10-200 mum with/without a twist (ex. ring, Mobius strip). Their distinctive topology seems to offer systems for studying possible new quantum phenomena. Samples were obtained by chemical vapor transportation method and identified as NbSe3 Crystals by electron diffraction. SEM studies revealed that a loop is formed from a NbSe3 whisker that wraps around a droplet of selenium by forces of surface tension during crystal growth. Also we observed that a twist is introduced during this spooling process. Moreover, we performed transport measurements on the materials and found that, exclusively in samples with a twist, T-CDW is lower by a few K than that of NbSe3 whiskers. We suggest that the anomaly originates in local strain due to the twisted topology. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02287-1

    Web of Science

    researchmap

  • Structural and electrical properties of TaSe3 ring crystals Reviewed

    T Matsuura, S Tanda, K Asada, Y Sakai, T Tsuneta, K Inagaki, K Yamaya

    PHYSICA B-CONDENSED MATTER   329-333   1550 - 1551   2003.5

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:ELSEVIER SCIENCE BV  

    We have investigated structural and electrical properties of "ribbon-knot" crystals of TaSe3 (superconductor) having nontrivial topological structures. They are shaped a ring, a Mobius strip and a 2pi-twisted loop, so they can be categorized by a ribbon knot topological invariant in the mathematics field. For investigation of structural property of the ring crystals, cutting operation was performed for 45 specimens of the TaSe3 ring crystal using focused ion beam milling. The cutting operation transformed them to arc-shape crystals having homogeneous curvatures. At low temperature, thin ring crystals of TaSe3 showed superconductivity, however, thick rings showed nonmetallic behavior. The experimental results suggest that the ring-shape structure affect the electrical behavior in the TaSe3 ring crystal. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02290-1

    Web of Science

    researchmap

  • Conductive oxide cantilever for cryogenic nano-potentiometry Reviewed

    T Hiroya, K Inagaki, S Tanda, T Tsuneta, K Yamaya

    PHYSICA B-CONDENSED MATTER   329   1635 - 1637   2003.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Nanoscale electrical transport properties have attracted attentions because of new phenomena such as ballistic transport, quantized resistance, and Coulomb blockade. For measurement of nanoscale resistance, we have been developing a cryogenic atomic force microscope that can operate at 1.8 K. To use it as an electrode, we coated the cantilever with conductive oxides of TiO and indium tin oxide (ITO). We verified that TiO and ITO thin films remain conductive even at 4.2 K. Also we measured I V characteristics of the tip-sample contact with a standard sample of NbSe2 single crystal, and found that the conductive coats were not lost under large stresses due to the tip-sample contact. Moreover, we succeeded in obtaining a room temperature nano-potentiometry of a gold thin film with the ITO coated cantilever. In conclusion, the TiO and ITO coated cantilevers are applicable to cryogenic nano-potentiometry. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02435-3

    Web of Science

    researchmap

  • The formation by the spooling mechanism of NII-twisted loop crystals of NBSE3: A new CDW conductor Reviewed

    T Tsuneta, S Tanda, K Inagaki, K Yamaya, N Hatakenaka

    TOWARDS THE CONTROLLABLE QUANTUM STATES: MESOSCOPIC SUPERCONDUCTIVITY AND SPINTRONICS   497 - 501   2003

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We found new types of niobium triselenide (NbSe3) crystal that have the shapes of a loop with a twist of n pi (n = 0, 1,2) with a size on scale of 10-100 micrometers. We named them "topological crystals" after their distinctive topologies. The crystals were synthesized by direct vapor phase reaction of selenium and niobium. We revealed that a droplet of liquid selenium is responsible for the formation of the crystals, acting as a spool that takes up a NbSe3 whisker by the force of surface tension. As a result, a loop crystal wrapping around the droplet is formed. Twisted loops, such as a Mobius strip, are produced through similar spooling mechanisms that involve either a double spooling or an autonomous twisting of a whisker. We performed electrical transport measurements on the crystal and confirmed the transitions into charge-density-wave (CDW) phases that are characteristic of the substance, NbSe3. It was revealed that loops without a twist and with a twist exhibit qualitatively different behaviors; CDW transition temperatures decrease and the width of transitions broaden for some of twisted rings, while none of the twist-free rings shows such features. The electronic properties seem to be affected by crystallographic difference due to their variant topologies.

    Web of Science

    researchmap

  • Topological change of topological materials Reviewed

    T Matsuura, S Tanda, K Asada, Y Sakai, T Tsuneta, K Inagaki, K Yamaya

    TOWARDS THE CONTROLLABLE QUANTUM STATES: MESOSCOPIC SUPERCONDUCTIVITY AND SPINTRONICS   207 - 212   2003

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:WORLD SCIENTIFIC PUBL CO PTE LTD  

    We have investigated structural and electrical properties of ribbon-knot crystals of low-dimensional conductors, such as TaSe3 (superconductor) and NbSe3 (charge-density-waves conductor), having some topological invariant characteristics. We cut some specimens of TaSe3 ring crystals using focused ion beam sputtering to obtain the structural property (e.g., elasticity and plasticity). The cut specimens of ring crystal transformed to arc-shape with homogeneous curvatures, and the cut thick rings had a tendency to keep strongly their shapes. From result of electrical measurement at low temperature, whisker and thin ring crystals of TaSe3 show superconductivity, however, thick rings show increase resistance with decreasing temperature. The geometrical parameter, thickness, dominates the structural and the electrical properties in the ring crystals.

    Web of Science

    researchmap

  • Hall coefficients and resistivities of Bi2+xSr2-xCuOy single crystals: The presence of a mobility edge in correlated two-dimensional electron system

    K Inagaki, S Tanda

    JOURNAL OF APPLIED PHYSICS   92 ( 9 )   5214 - 5217   2002.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    Hall coefficients and resistivities of a series of Bi2+xSr2-xCuOy single crystals were measured to investigate the relation between the carrier concentration n and the resistivity-minimum temperature T-min. The T-min was found to obey a simple linear relation: T-min proportional to n(c)-n, where n(c)similar or equal to4.2x10(21) cm(-3) is a critical carrier concentration. A model of two-dimensional electron systems with a mobility edge was introduced to explain this linear relation, and the presence of a mobility edge in two-dimensional copper-oxide-based metals was suggested. (C) 2002 American Institute of Physics.

    DOI: 10.1063/1.1509842

    Web of Science

    researchmap

  • Charge density wave, superconductivity, and non-metallic behaviour under high pressure in ZrTe3 Reviewed

    K Igarashi, S Yasuzuka, K Inagaki, S Tanda, Y Okajima, M Hedo, Y Uwatoko, K Yamaya

    JOURNAL DE PHYSIQUE IV   12 ( PR9 )   97 - 98   2002.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:E D P SCIENCES  

    The charge-density-wave (CDW) order of low-dimensional inorganic conductor ZrTe3 is found to increase with increasing pressure, while the superconductivity with filamentary nature is significantly suppressed. It was evidenced in resistivity measurements under pressure up to 0.8 Gpa. The present results suggest that competition between the superconductivity and the CDW is not simply explained by a nesting effect of the Fermi surface, but other origin is needed. Non-metallic behaviour is also found below 4K under high pressures above 0.6 Gpa. The relationship between the non-metallic state and the pressure-enhanced CDW is expected, although yet inexplicable.

    DOI: 10.1051/jp4:20020369

    Web of Science

    Scopus

    researchmap

  • Hysteresis of the cantilever shift in ultrasonic force microscopy

    K Inagaki, O Matsuda, OB Wright

    APPLIED PHYSICS LETTERS   80 ( 13 )   2386 - 2388   2002.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    We propose a technique based on ultrasonic force microscopy that exploits the hysteresis in cantilever jumping to and from a sample while varying the ultrasonic amplitude. Both the elastic modulus and the work of adhesion can be determined by comparision with a relation derived between their ratio and the cantilever shift at the jump-in point. The method is applied to measurements on an aluminum thin film. (C) 2002 American Institute of Physics.

    DOI: 10.1063/1.1463212

    Web of Science

    researchmap

  • Hall coefficients in the superconductor-insulator transition of Bi2+xSr2-xCuOy: Measurement of Hall-bar shaped single crystals fabricated by excimer-laser cutting Reviewed

    K Inagaki, S Tanda, K Sajiki

    APPLIED PHYSICS LETTERS   69 ( 20 )   3075 - 3077   1996.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    Hall coefficients and resistivities of a series of Bi2+xSr2-xCuOy single crystals were measured to investigate the relation between the carrier concentration and the disorder of the system in the superconductor-insulator transition. Excimer-laser cutting technique was applied to fabricate the Hall-bar shaped samples in order to determine precisely the transport properties of the single crystals. The Hall coefficients were found to be independent of the temperature, which suggests Coulomb interaction was negligible in the localized regime of Bi2+xSr2-xCuOy. We found the Ioffe-Legel condition k(F)l similar to 1 laid around n(0) similar to 8 x 10(20) cm(-3) in this system, and the carriers in the localized regime were essentially ''metallic.'' (C) 1996 American Institute of Physics.

    Web of Science

    researchmap

  • Transport properties of localized states in Bi2Sr2CuO6 single crystals Reviewed

    K Inagaki, K Yamaya, S Tanda

    PHYSICA C   263 ( 1-4 )   321 - 324   1996.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Transport properties, such as electric conductivity, magnetoresistance, and Hall coefficient are measured in Bi2Sr2CuO6 single crystals. The conductivity drops at low temperature proportional to log T. This behavior is interpreted as the weakly localized regime of Anderson localization, since we observe log T, log E and log H dependences of the conductivity. The coefficients of log T and log E come close to the expected values by treating the sample as consisting of stacked two-dimensional conduction planes, However, the coefficient of log H is much less than the universal value which is expected from theories of the weakly localized regime. From the results of Hall measurement, we show that electron-electron interaction does not play a major role.

    Web of Science

    researchmap

  • Transport properties of Bi2Sr2CuO6 single crystals: Possibility of interplane coupling in the weakly localized regime Reviewed

    K Inagaki, S Tanda

    PHYSICAL REVIEW B   53 ( 14 )   R8902 - R8905   1996.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    Transport properties of Bi2Sr2CuO6 single crystals, including the electric conductivity magnetoresistance, and Hall coefficient, were measured. Characteristics of the conductivity in the weakly localized regime, which includes temperature, electric field, and magnetic field, were also measured. The coefficient of In H was found to be much smaller than the theoretical value predicted for the weakly localized regime. Measurement of the Hall coefficient indicates that the electron-electron interaction does not play a significant role in the conductivity. Rather, interplane coupling appears to play a role in the transport properties of this system.

    Web of Science

    researchmap

  • Superconductor-insulator transition in ultrathin Pb films: Localization and superconducting coherence Reviewed

    K Kagawa, K Inagaki, S Tanda

    PHYSICAL REVIEW B   53 ( 6 )   R2979 - R2982   1996.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    We have measured temperature-dependent resistivities of a set of Pb ultrathin films by repeating in situ deposition at liquid-He temperature. Observed conductance in the fermion region can be described by a single-parameter scaling function (beta function) with a self-consistent theory for localization in two dimensions. Based on estimated values of electrical localization length (xi(loc)) and superconducting coherence length (xi(super)), the superconductor-insulator transition is confirmed to occur at the point where xi(loc)similar to 2 xi(super). Moreover, only samples exhibiting lnT dependence in the fermion region become global coherent superconductors at low temperature.

    Web of Science

    researchmap

  • Transport properties oC single crystals: Possibility of interplane coupling in the weakly localized regime Reviewed

    Katsuhiko Inagaki, Satoshi Tanda

    Physical Review B - Condensed Matter and Materials Physics   53 ( 14 )   R8902 - R8905   1996

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Transport properties of (Formula presented)(Formula presented)Cu(Formula presented) single crystals, including the electric conductivity magnetoresistance, and Hall coefficient, were measured. Characteristics of the conductivity in the weakly localized regime, which includes temperature, electric field, and magnetic field, were also measured. The coefficient of (Formula presented) was found to be much smaller than the theoretical value predicted for the weakly localized regime. Measurement of the Hall coefficient indicates that the electron-electron interaction does not play a significant role in the conductivity. Rather, interplane coupling appears to play a role in the transport properties of this system. © 1996 The American Physical Society.

    DOI: 10.1103/PhysRevB.53.R8902

    Scopus

    researchmap

  • Nonlinear conductivity of Bi2Sr2CuO6 single crystals Reviewed

    Katsuhiko Inagaki, Satoshi Tanda, Tsuneyoshi Nakayama

    Physica C: Superconductivity and its applications   235-240 ( 2 )   1361 - 1362   1994

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    We have observed the nonlinear current-voltage characteristics of Bi2Sr2CuO6 single crystals in the weakly localized regime (WLR), in which the conductivity indicates a logarithmic dependence both on temperature and on magnetic fields. The conductivity in low voltage remaines constant (Ohmic behavior). Upon application of a voltage higher than the threshold electric field 0.1V/cm, the conductivity begins to increase. The observed threshold of the electric field is much smaller than the value of 200V/cm estimated from the model which Anderson et al. (1979) introduced to explain the nonlinear conductivity shown in the WLR of thin metal films. © 1994.

    DOI: 10.1016/0921-4534(94)91905-4

    Scopus

    researchmap

▼display all

MISC

  • Transport phenomena of nanoscale NbS<sub>3</sub> (III)

    福田雄太, 山本楓丸, 漆原和, 延兼啓純, 稲垣克彦, 丹田聡

    日本物理学会講演概要集(CD-ROM)   78 ( 1 )   2023

  • Evidence of mono-and bi-string CDW

    山本楓丸, 福田雄大, 漆原和, 下田周平, 延兼啓純, 市村晃一, 稲垣克彦, 丹田聡

    日本物理学会講演概要集(CD-ROM)   78 ( 1 )   2023

  • Transport phenomena of nanoscale NbS<sub>3</sub> (II)

    福田雄太, 江花昭哉ショーン, 小野寺鴻畝, 延兼啓純, 稲垣克彦, 丹田聡

    日本物理学会講演概要集(CD-ROM)   77 ( 1 )   2022

  • Magnetoresistance of MX3

    江花昭哉ショーン, 福田雄太, 延兼啓純, 稲垣克彦, 市村晃一, 丹田聡

    日本物理学会講演概要集(CD-ROM)   77 ( 1 )   2022

  • Anisotropic magnetoresistance of charge-density wave in o-TaS3

    Katsuhiko Inagaki, Toru Matsuura, Masakatsu Tsubota, Shinya Uji, Tatsuya Honma, Satoshi Tanda

    PHYSICAL REVIEW B   93 ( 7 )   2016.2

     More details

    Language:English   Publishing type:Internal/External technical report, pre-print, etc.   Publisher:AMER PHYSICAL SOC  

    We report the magnetoresistance of a charge-density wave (CDW) in o-TaS3 whiskers at 4.2 K under a magnetic field up to 5.2 T. An anisotropic negative magnetoresistance was found in the nonlinear regime of current-voltage characteristics. The angle dependence of the magnetoresistance, studied by rotating the magnetic field upon the c axis, exhibited a twofold symmetry. The magnetoresistance amplitude exhibited maxima when the field was parallel to the a axis, whereas it vanished to the b axis. The observed anisotropy may come from a difference in interchain coupling of adjacent CDWs along the a and b axes. Comparison of the anisotropy to the scanning tunneling microscope image of CDWs allows us to provide a simple picture to explain the magnetoresistance in terms of delocalization of quantum interference of CDWs extending over the b-c plane.

    DOI: 10.1103/PhysRevB.93.075423

    Web of Science

    arXiv

    researchmap

  • 24aBC-5 Superconductive vortex in Topological crystal

    Ikeda T., Kumagai G., Matsuura T., Inagaki K., Tanda S.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   830 - 830   2012.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 22aHC-5 CDW and Cylinder Vortex in Topological Crystals

    Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   228 - 228   2011.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 22aHC-5 CDW and Cylinder Vortez in Topological Crystals

    Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   807 - 807   2011.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 21aHC-10 Superconductive vortex in Topological crystal

    Ikeda T., Kumagai G., Matsuura T., Inagaki K., Tanda S.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   798 - 798   2011.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 20aHX-4 Breaking of duality of vortex configuration in hierarchical superconducting networks

    Tsuchiya S, Toshima T, Nobukane H, Inagaki K, Ichimura K, Tanda S

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   812 - 812   2010.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Optical selection of a multiple phase order in the charge density wave condensate o-TaS3 using a spectrally resolved nonequilibrium measurement

    Y. Toda, R. Onozaki, M. Tsubota, K. Inagaki, S. Tanda

    PHYSICAL REVIEW B   80 ( 12 )   121103(R)   2009.9

     More details

    Language:English   Publisher:AMER PHYSICAL SOC  

    We investigate the spectrally resolved transient reflectivity changes Delta R(T,tau,lambda) in the charge density wave (CDW) conductor o-TaS3. A distinct near-infrared resonance in this compound emphasizes the characteristic Delta R(lambda) resonances, and allows a selection of coexisting CDW phases with different nonequilibrium carrier dynamics. Furthermore, the spectrally resolved Delta R(tau) characterizes the collective oscillations associated with the individual states. We believe that this demonstration paves the way for the optical selection of the multiphase order that plays an important role in various macroscopic quantum systems.

    DOI: 10.1103/PhysRevB.80.121103

    Web of Science

    researchmap

  • 25pYA-11 Observation of Aharonov-Bohm effect by charge-density wave in TaS_3 ring crystals, III

    Tsubota Masakatsu, Inagaki Katsuhiko, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   692 - 692   2009.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 25pYA-10 Phase slip voltage of Quasi-one dimensional conductor o-TaS_3

    Inagaki Katsuhiko, Tsubota Masakatsu, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   692 - 692   2009.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 25aRK-13 Discovery of parity violation in a single domain of Sr_2RuO_4

    Nobukane H, Inagaki K, Ichimura K, Yamaya K, Takayanagi S, Kawasaki I, Tenya K, Amitsuka H, Konno K, Asano Y, Honma T, Tanda S

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   410 - 410   2009.8

     More details

    Language:Japanese   Publisher:社団法人日本物理学会  

    CiNii Books

    researchmap

  • Aharonov-Bohm Effect at liquid-nitrogen temperature: Frohlich superconducting quantum device

    Masakatsu Tsubota, Katsuhiko Inagaki, Satoshi Tanda

    EPL 97, (2012) 57011   2009.6

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    The Aharonov-Bohm (AB) effect has been accepted and has promoted<br />
    interdisciplinary scientific activities in modern physics. To observe the AB<br />
    effect in condensed matter physics, the whole system needs to maintain phase<br />
    coherence, in a tiny ring of the diameter 1 micrometer and at low temperatures<br />
    below 1 K. We report that AB oscillations have been measured at high<br />
    temperature 79 K by use of charge-density wave (CDW) loops in TaS3 ring<br />
    crystals. CDW condensate maintained macroscopic quantum coherence, which<br />
    extended over the ring circumference 85 micrometer. The periodicity of the<br />
    oscillations is h/2e in accuracy within a 10 percent range. The observation of<br />
    the CDW AB effect implies Frohlich superconductivity in terms of macroscopic<br />
    coherence and will provide a novel quantum interference device running at room<br />
    temperature.

    DOI: 10.1209/0295-5075/97/57011

    arXiv

    researchmap

  • 27pYE-4 Optoelectric stopwatch and its application to laboratory classes

    Inagaki K., Tomoda M.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   403 - 403   2009.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Evidence of circulating charge density wave current: Shapiro interference in NbSe3 topological crystals

    Toru Matsuura, Katsuhiko Inagaki, Satoshi Tanda

    PHYSICAL REVIEW B   79 ( 1 )   014304   2009.1

     More details

    Language:English   Publisher:AMER PHYSICAL SOC  

    We investigate the topological effect of charge density wave (CDW). We found a "beat" Shapiro step structure in NbSe3 topological (ring) crystals. We interpreted it as an evidence of the circulating CDW current that flows in the rings and modifies the CDW fundamental frequency, namely, narrow-band-noise frequency. This result also implied that a precursor of Frohlich&apos;s CDW supercurrent emerged in the ring system.

    DOI: 10.1103/PhysRevB.79.014304

    Web of Science

    researchmap

  • Field-induced discommensuration in charge density waves in o-TaS3

    Katsuhiko Inagaki, Masakatsu Tsubota, Kazuki Higashiyama, Koichi Ichimura, Satoshi Tanda, Kenichiro Yamamoto, Noriaki Hanasaki, Naoshi Ikeda, Yoshio Nogami, Takayoshi Ito, Hidenori Toyokawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 9 )   093708   2008.9

     More details

    Language:English   Publisher:PHYSICAL SOC JAPAN  

    We report a synchrotron X-ray Study of charge density waves (CDWs) in an o-TaS3 crystal. We found that two independent CDWs coexist ill the temperature range of 130-50K. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors q(c) = 0.252c* and 0.250c*, respectively. The temperature and electric current dependences of the intensity of the two CDW satellites were measured. We found that the commensurate CDW was converted to the incommensurate CDW at 80 K by inducing current flow. Our observation was interpreted in terms of the dynamics of topological defects. We determined the edge dislocation configuration from the electric Current dependence of the intensity of the two CDWs. The result implies Cor the first time that discommensurations are induced ill the commensurate CDW by applying an electric field.

    DOI: 10.1143/JPSJ.77.093708

    Web of Science

    researchmap

  • 23aWA-4 Field-induced discommensuration in o-TaS_3

    Inagaki Katsuhiko, Tsubota Masakatsu, Higashiyama Kazuki, Ichimura Koichi, Tanda Satoshi, Yamamoto Kenichiro, Hanasaki Noriaki, Ikeda Naoshi, Nogami Yoshio, Ito Takayoshi, Toyokawa Hidenori

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   753 - 753   2008.2

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 23aWA-11 Little-Parks oscillation in hierarchical superconducting networks

    Tsuchiya Satoshi, Nobukane Hiroyosi, Toshima Takeshi, Konno Koukichi, Inagaki Katsuhiko, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   755 - 755   2008.2

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 23aWA-2 Circulating current observed by Shapiro step measurement for ringshaped crystals of NbSe_3

    Matsuura Toru, Inagaki Katsuhiko, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   753 - 753   2008.2

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 21pXQ-9 The ordering process of superconductivity and topological defects in Sr2RuO4.

    Nobukane H., Tsutiya S., Konno K., Inagaki K., Kawasaki I., Tenya K., Maeno Y., Tanda S.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   809 - 809   2007.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 21aTG-10 Transport measurement of superconducting nanocrystals

    Inagaki Katsuhiko, Nobukane Hiroyoshi, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   677 - 677   2007.8

     More details

    Language:Japanese   Publisher:社団法人日本物理学会  

    CiNii Books

    researchmap

  • 18pRD-10 Discovery of asymmetric Shapiro steps in ring-shaped crystals of NbSe_3

    Matsuura Toru, Inagaki Katsuhiko, Tanda Satishi

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   768 - 768   2007.2

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 18pRD-7 Measurement of topological soliton formation under non-equilibrium : Study of the early universe in the laboratory

    Nobukane Hiroyoshi, Tsutiya Satoshi, Konno Koukichi, Inagaki Katsuhiko, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   768 - 768   2007.2

     More details

    Language:Japanese   Publisher:社団法人日本物理学会  

    CiNii Books

    researchmap

  • 19aPS-52

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   567 - 567   2007.2

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 18pRD-11 Observation of Aharonov-Bohm effect by chargedensity wave in TaS_3 ring crystals, II

    Tsubota Masakatsu, Inagaki Katsuhiko, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   769 - 769   2007.2

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 23aZA-1 Property of superconducting hierarchal networks in a magnetic field

    Tsuchiya Satoshi, Nobukane Hiroyosi, Toshima Takeshi, Inagaki Katsuhiko, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   630 - 630   2006.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Topological effects of charge density waves in ring-shaped crystals of NbSe3

    T Matsuura, T Tsuneta, K Inagaki, S Tanda

    PHYSICAL REVIEW B   73 ( 16 )   165118   2006.4

     More details

    Language:English   Publisher:AMERICAN PHYSICAL SOC  

    We studied the differences of the charge density wave (CDW) dynamics in closed-ring and open-ring topologies by measuring the frequency-dependent resistance in the radio-frequency range. We performed a two-probe ac resistance measurement for a ring-shaped crystal of niobium triselenide (NbSe3) in the 300 kHz to 1.3 GHz frequency range. We compared the frequency dependence of the resistance of closed-ring and open-ring crystals and found that the pinning potential in the former is smaller than that in the latter. The open-ring crystal was obtained by changing of the topology of the closed-ring crystal. We believe that the reduction in the pinning effect is caused by a CDW circulating current in the closed-ring topology.

    DOI: 10.1103/PhysRevB.73.165118

    Web of Science

    researchmap

  • 27pXF-9 Fabrication and electric properties of nanoscale charge-density-wave systems, II

    Inagaki Katsuhiko, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   772 - 772   2006.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 27pXF-5 Hierarchal structure in charge density wave system (2)

    Toshima T., Inagaki K., Hatakenaka N., Tanda S.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   771 - 771   2006.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 27pXF-10 Aharonov-Bohm effect of charge density wave on TaS3 ring crystals

    Tsubota Masakatsu, Tanda Satoshi, Inagaki Katsuhiko

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   773 - 773   2006.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 27pXF-7 TOPOLOGICAL EFFECT IN CHARGE DENSITY WAVE DYNAMICS

    Matsuura Toru, Tsuneta Taku, Inagaki Katsuhiko, Tanda Satoshi

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   772 - 772   2006.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Supercluster of electrons in ultrathin TaSe2 nanocrystals

    T Toshima, K Inagaki, N Hatakenaka, S Tanda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 2 )   024706   2006.2

     More details

    Language:English   Publisher:PHYSICAL SOC JAPAN  

    We discover a supercluster of electrons in the ultrathin TaSe2 crystals synthesized by our developed de-chalcogenide method. The supercluster has all unexpected structure containing 61 electrons denoted by root 61 x root 61, in addition to a root 49 x root 49 supercluster based on root 7 x root 7 clusters expected in triangle lattices. This new hierarchal structure and successive clustering cannot be explained by a conventional electron clustering mechanism assisted by background lattice distortions, i.e., charge-density-wave formation mechanism based on Fermi surface nesting. We propose an alternative possible formation mechanism based on saddle-point nesting, taking into account a trigonal symmetry as well as lattice distortion energy.

    DOI: 10.1143/JPSJ.75.024706

    Web of Science

    researchmap

  • Soliton transport in nanoscale o-TaS3 crystals

    K Inagaki, T Toshima, S Tanda

    JOURNAL DE PHYSIQUE IV   131   75 - 76   2005.12

     More details

    Language:English   Publisher:EDP SCIENCES S A  

    We report studies of o-TaS3 nanocrystals, including sample preparation of nanocrystals, fabrication of electrodes attached to the nanocrystals, and transport properties. Absence of the clear Peierls transition and one-dimensional variable-range-hopping conduction were observed. We also found finite-size effect of soliton transport in nanoscale o-TaS3 crystals. These results are consistent with the idea that electric transport phenomenon of the nanoscale o-TaS3 crystals should be attributed to soliton nucleation.

    DOI: 10.1051/jp4:2005130016

    Web of Science

    researchmap

  • Gold nanoparticle decoration of DNA on silicon

    G Braun, K Inagaki, RA Estabrook, DK Wood, E Levy, AN Cleland, GF Strouse, NO Reich

    LANGMUIR   21 ( 23 )   10699 - 10701   2005.11

     More details

    Language:English   Publisher:AMER CHEMICAL SOC  

    Electrostatic assembly of cationic nanoparticles onto the negatively charged backbone of double-stranded DNA has been shown to produce one-dimensional chains with potential use as nanoelectronic components. In this paper, micron long DNA templates stretched on aminosilane- and hexamethyldisilazane-modified silicon surfaces are used to assemble 3.5 nm gold nanoparticles passivated with cationic thiocholine. Atomic force microscopy is used to analyze the density and defects along the similar to 5 nm high structures, with comparison between positively charged and neutral surfaces. Low background adsorption of nanoparticles is facilitated by both these surface chemistries, while the neutral surface yields a more densely packed assembly.

    DOI: 10.1021/la0515367

    Web of Science

    PubMed

    researchmap

  • Fabrication of electrodes on charge-density-wave nanoscale crystals

    K Inagaki, T Toshima, S Tanda, K Yamaya

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   426   1736 - 1740   2005.10

     More details

    Language:English   Publisher:ELSEVIER SCIENCE BV  

    The reduction of the system size may lead to new developments in macroscopic quantum systems such as superconductors and charge-density-wave systems. In order to investigate such effects, thin films and thin wires are generally fabricated by an evaporation technique. However, this technique can only be applied to a limited number of materials; hence, a more versatile technique is required. In this study, we provide the results of our recent study on the fabrication of electrodes on nanoscale crystals. Gold electrodes, which were 400 nm in width, were fabricated by a standard lift-off technique on o-TaS3 charge-density-wave nanocrystals, which were prepared by deposition on silicon substrates. The interface resistance was higher than 100 G Omega just after evaporation and was decreased significantly by electron beam irradiation. The electrodes were tested down to 80 mK and were found to be fairly durable for cryogenic measurement. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physc.2005.01.083

    Web of Science

    researchmap

  • Dynamics of charge density wave ring

    T Matsuura, T Tsuneta, K Inagaki, S Tanda

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   426   431 - 435   2005.10

     More details

    Language:English   Publisher:ELSEVIER SCIENCE BV  

    We investigate the ac conductivity of charge density wave (CDW) rings, which are topologically different from whiskers. We synthesize ring crystals of NbSe3, a CDW material, by the selenium droplet spooling method. The ac conductivity is measured for both the rings and the whiskers in the frequency range of 10 kHz- 150 MHz. We analyze the frequency dependence of the ac conductivity of the CDW rings and the whiskers using a simple washboard potential model. The result suggests that the CDW rings have a larger effective mass and a higher pinning frequency than the CDW in the whiskers and that the topology of the crystals plays an important role in CDW dynamics. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physc.2005.02.141

    Web of Science

    researchmap

  • 20aPS-42 Little-Parks Oscillations in Unconventional Superconductor Sr_2RuO_4

    Ishii A., Tenya K., Amitsuka H., Inagaki K., Tanda S., Deguchi K., Maeno Y.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   437 - 437   2005.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Dimensional crossover of soliton transport in TaS3 nanocrystals

    K Inagaki, T Toshima, S Tanda

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   66 ( 8-9 )   1563 - 1566   2005.8

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Reduction of the sample size leads to a new phenomena through a change in system dimensionality. Progress of nanotechnology allows us to seek for such a size-driven effect of quasi-one-dimensional materials. Here we report recent studies of o-TaS3 nanocrystals. We found that the nonlinear conduction due to soliton transport in the charge-density-wave system became independent of temperature below 2 K. The observed I-v curves were classified to two kinds. One kind of the samples exhibit the standard activation formula, I proportional to exp[-E-0/E-2], whereas other kind of the samples show a modified form, I proportional to exp[-(E-0/E)(2)], where E-0 is a constant, and E is an applied field. Since both kinds of the samples were synthesized in a same batch, it is plausible to attribute the difference of the I-V curves to that of the sample sizes. We interpreted it as the dimensional crossover of soliton transport, in the framework provided by Hatakenaka et al. They predicted the quantum nucleation possibility of the solutions T, which is proportional to the current, obeys a dimensionality-dependent formula, F proportional to exp(const./E-D), where D is the system dimension. According to this, our observation suggests that the system dimension relevant to soliton transport was either D = 1 or D = 2, which depends on the system size. (c) 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jpcs.2005.05.058

    Web of Science

    researchmap

  • Finite-size effects on transverse magnetoresistance of NbSe3

    Y Takahide, S Uji, K Enomoto, T Konoike, T Terashima, M Nishimura, T Tsuneta, K Inagaki, S Tanda, K Yamaya

    PHYSICAL REVIEW B   71 ( 13 )   134409 - 134409   2005.4

     More details

    Language:English   Publisher:AMERICAN PHYSICAL SOC  

    A charge-density-wave material NbSe3 with thickness less than 1 mu m shows a distinct peak in the low temperature transverse magnetoresistance when the magnetic field is applied along the c axis. The resistance peak is less pronounced as the field is tilted away from the c axis to the a* axis. The peak height also decreases as the temperature increases, although the magnetic field at the peak shows no appreciable dependence on temperature. The resistance peak is attributed to surface diffuse scattering of normal carriers which remain even below the lower charge-density-wave transition temperature.

    DOI: 10.1103/PhysRevB.71.134409

    Web of Science

    researchmap

  • Fabrication of nanoscale charge density wave systems

    K Inagaki, T Toshima, S Tanda, K Yamaya, S Uji

    APPLIED PHYSICS LETTERS   86 ( 7 )   073101   2005.2

     More details

    Language:English   Publisher:AMER INST PHYSICS  

    Nanoscale charge density wave systems of quasi-one-dimensional o-TaS3 crystals were fabricated. Gold electrodes 400 nm wide were made by standard lift-off technique on o-TaS3 nanocrystals prepared by deposition on silicon substrates. Interface resistance was higher than 100 GOmega just after evaporation, and were significantly reduced by electron-beam irradiation. The electrodes were tested down to 80 mK, and were found quite durable for cryogenic measurement. The temperature dependence of the resistance of the nanocrystal was represented as the variable-range-hopping-type conduction with one dimension over the wide range of temperature, from 4.2 to 100 K. This behavior was different from that of conventional bulk samples. (C) 2005 American Institute of Physics.

    DOI: 10.1063/1.1862782

    Web of Science

    researchmap

  • Anomalous doping effect on Ag-doped DNA conductor

    H Mayama, T Hiroya, K Inagaki, S Tanda, K Yoshikawa

    CHEMICAL PHYSICS LETTERS   397 ( 1-3 )   101 - 105   2004.10

     More details

    Language:English   Publisher:ELSEVIER SCIENCE BV  

    We report novel experimental results of chemical doping effect on Ag-doped DNA conductor. The prepared Ag-doped DNA samples were confirmed by EXAFS that Ag+ was doped into pi-way. In I-V measurements at room temperature, nonlinear I-V curves with hysteresis emerged and systematic change in electrical conductivity a was observed from 10(-10) to 10(-6) Omega(-1) cm(-1) under doping condition [Ag+]/[Base pair] = 10(-6)-10. The relation between the conductivity and dopant concentration showed a weak dependence a proportional to [Ag+](0.5). This 'weakly doping effect' may be caused by the long-range correlated randomness of sequence in DNA, in contrast with usual doped organic conductors. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2004.08.061

    Web of Science

    researchmap

  • 12pTM-8 Dynamics of Charge Density Wave Ring

    Matsuura Toru, Tanda Satoshi, Tsuneta Taku, Inagaki Katsuhiko, Yamaya Kazuhiko

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   700 - 700   2004.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 12pTM-10 Boundary scattering effect on magnetoresistance in a thin quasi-1D conductor NbSe_3

    Yamaguchi T., Enomoto K., Kounoike T., Nishimura M., Yakabe T., Suzuki H., Terashima T., Uji S., Tsuneta T., Inagaki K., Tanda S., Yamaya K.

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   700 - 700   2004.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 27pYD-11 Fabrication and electric properties of nanoscale charge density wave systems

    Inagaki K., Tanda S., Uji S.

    Meeting abstracts of the Physical Society of Japan   59 ( 1 )   802 - 802   2004.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 29pWN-4 Electrical conduction in Metal-doped DNA

    Hiroya T., Mayama H., Inagaki K., Tanda S., Yoshikawa K.

    Meeting abstracts of the Physical Society of Japan   59 ( 1 )   862 - 862   2004.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 27pYD-13 Competition and Coexistence of Charge Density Wave and Superconductivity in ZrTe_3 under High Pressure

    Yomo R., Inagaki K., Tanda S., Yamaya K., Ablize Melike, Hedo M., Uwatoko Y.

    Meeting abstracts of the Physical Society of Japan   59 ( 1 )   802 - 802   2004.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • TaS2,TaSe2電荷密度波(CDW)による操作型顕微鏡の開発

    大河裕之, 豊嶋剛司, 常田啄, 西田宗人, 稲垣克彦, 丹田聡

    応用物理学関係連合講演会講演予稿集   51st ( 2 )   2004

  • Formation of metallic NbSe2 nanotubes and nanofibers

    T Tsuneta, T Toshima, K Inagaki, T Shibayama, S Tanda, S Uji, M Ahlskog, P Hakonen, M Paalanen

    CURRENT APPLIED PHYSICS   3 ( 6 )   473 - 476   2003.12

     More details

    Language:English   Publisher:ELSEVIER SCIENCE BV  

    We succeed in synthesizing NbSe2 nanotubes along with nanofibers by chemical vapor transportation. They are stable crystalline systems and can be synthesized reproducibly in a nearly equilibrium reacting process. We have investigated these nanosize structures of NbSe2 by transmission electron microscopy and electron diffraction. Both of the structures have a similar size of 100-200 nm in diameter. While nanotubes consist of rolled-up NbSe2 layers, nanofibers are a pile of thin flat layers. We propose a mechanism of the formation of NbSe2 nanotubes and nanofibers on the basis of deseleniditive transition from a NbSe3 fiber-shaped crystal. We also measured electrical resistance of the nanofibers with conductive atomic force microscopy and demonstrated that the material show metallic behavior at room temperature. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cap.2003.07.002

    Web of Science

    researchmap

  • Non-Electrode Resistance- Measurement and Application for Topological Matters

    Matsuura Toru, Tanda Satoshi, Inagaki Katsuhiko

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   688 - 688   2003.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Collective excitations and their temperature dependences of CDW in 1T-TaS_2

    Toda Y., Tateishi K., Inagaki K., Ichimura K., Tanda S.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   646 - 646   2003.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • X-ray structural study of CDW modulation in ZrTe_3

    Nogami Y., Yamaya K., Tanda S., Inagaki K.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   689 - 689   2003.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Dimension conversion of transition metal chalcogenide systems

    Toshima T., Tsuneta T., Ookawa H., Inagaki K., Tanda S.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   688 - 688   2003.8

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Low-temperature specific heat in the charge-density-wave state of ZrTe3 and NbTe4

    S Mori, Y Okajima, K Inagaki, S Tanda, K Yamaya

    PHYSICA B-CONDENSED MATTER   329   1298 - 1299   2003.5

     More details

    Language:English   Publisher:ELSEVIER SCIENCE BV  

    Low-temperature specific heat of CDW compounds ZrTe3 and NbTe4, measured between 1.5 and 10 K, exhibited an anomaly which deviates from the regular phonon term; an excess specific-heat contribution appeared around T = 6 K. The excess contribution was well presented in terms of the phason contribution of CDW. The pinning frequency estimated from the analysis was quite high in comparison to the value of common CDW conductors, which is not inconsistent with the linear relation between current and voltage. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02252-4

    Web of Science

    researchmap

  • Non-Electrode Resistance-Measurement and Application for Topological Matters

    Matsuura Toru, Tanda Satoshi, Inagaki Katsuhiko

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   776 - 776   2003.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • A Möbius strip of single crystals

    Satoshi Tanda, Taku Tsuneta, Yoshitoshi Okajima, Katsuhiko Inagaki, Kazuhiko Yamaya, Noriyuki Hatakenaka

    Nature   417 ( 6887 )   397 - 398   2002.5

     More details

  • Waveguide ultrasonic force microscopy at 60 MHz

    K Inagaki, OV Kolosov, GAD Briggs, OB Wright

    APPLIED PHYSICS LETTERS   76 ( 14 )   1836 - 1838   2000.4

     More details

    Language:English   Publisher:AMER INST PHYSICS  

    We present measurements using ultrasonic force microscopy at similar to 60 MHz, operating in a "waveguide" mode in which the cantilever base is vibrated and flexural ultrasonic vibrations are launched down the cantilever without exciting any particular cantilever resonance. The nonlinearity of the tip-sample force-distance curve allows the conversion of a modulated ultrasonic frequency into a low frequency vibration of the cantilever, detected in a conventional atomic force microscope. Images of Ge quantum dots on a Si substrate show contrast related to elasticity and adhesion differences, and this is interpreted with the Johnson-Kendall-Roberts model of the force-distance curve. (C) 2000 American Institute of Physics. [S0003-6951(00)03114-4].

    DOI: 10.1063/1.126184

    Web of Science

    researchmap

  • Very high frequency ultrasonic force microscopy in waveguide mode

    Preliminary Proceedings of the 10th International Conference on Scanning Tunneling Microscopy/Spectroscopy and Related Proximal Probe Microscopy, Seoul, Korea   521 - 522   1999

     More details

  • 3a-E-1 Quantum phase Transition in two dimensions and critical exponent

    Kagawa K., Inagaki K., Tanda S., Yamaya K.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   51 ( 3 )   487 - 487   1996.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 31a-PS-53 Hall Coefficients of Bi_<2+x>Sr_<2-x>CuO_6 and Their Localized States

    INAGAKI K., YAMAYA K., TANDA S., NIWATSUKINO Y., SAJIKI K., AOYAMA I.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   51 ( 3 )   349 - 349   1996.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Superconductor-Insulator Transition In Ultrathin Pb Films

    KAGAWA Kazuhiro, TANDA Satoshi, INAGAKI Katsuhiko, YAMAYA Kazuhiko, NAKAYAMA Tuneyosi

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   50 ( 3 )   492 - 492   1995.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • Current-Voltage Characteristics of Localized States in Bi_2Sr_2CuO_6 Single Crystals

    INAGAKI Katsuhiko, TANDA Satoshi

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   50 ( 3 )   405 - 405   1995.3

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 12p-PSB-62 Current-Voltage Characteristics of Localizaed States in Bi_2Sr_2CuO_6 Single Crystals

    INAGAKI Katsuhiko, TANDA Satoshi, NAKAYAMA Tsuneyoshi

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1993 ( 3 )   383 - 383   1993.9

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

  • 27a-PS-7 Superconductor-Insulator Transition in Cuprate Superconductor

    Tanda S, Ohzeki S, Takahasi K, Inagaki K, Maeno T, Nakayama T

    1992 ( 3 )   378 - 378   1992.9

     More details

    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Books

    researchmap

▼display all

Works

  • トポロジカル結晶育成装置の開発

    2005

     More details

Research Projects

  • Fundamental study for charge-density-wave soliton devices

    Grant number:20560313  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    INAGAKI Katsuhiko

      More details

    Grant amount:\4,550,000 ( Direct Cost: \3,500,000 、 Indirect Cost:\1,050,000 )

    Fundamental study for charge-density-wave devices which exploit macroscopic quantum states was conducted. Experiments were performed on non-local transport phenomena of bulk samples and fabrication technique of nanocrystal electrodes. A new type of non-local transport phenomenon was found in the charge-density-wave state of quasi-one-dimensional conductor o-TaS3. This is explained in terms of motion of topological defects.

    researchmap

  • Quantum Effect and Synthesize of Topological quantum matter

    Grant number:15204029  2003 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    TANDA Satoshi, INAGAKI Katsuhiko, UJI Sinya, HATAKENAKA Noriyuki, HAYASHI Masahiko, MATSUYAMA Toyoki

      More details

    Grant amount:\48,230,000 ( Direct Cost: \37,100,000 、 Indirect Cost:\11,130,000 )

    We develop a new method to enhance two dimensionality of the system by making a thinner film using the "dechalcogenide method". The starting material is TaSe3 fibre, which is used as a template. The TaSe3 crystals are synthesized by the conventional chemical vapour transport method. The size of the TaSe3 crystals is typically 10 nm-1mm (thickness and width) and 100 nm-1 cm (length). We convert the TaSe3 crystals with nanoscale to TaSe2 ultrathin films. The TaSe3 crystals are set on a quartz plate in a sample chamber (Thermo Riko IVF298) evacuated to about 1×10^5 Torr. The sample chamber at approximately 1×10^3 Torr is filled with hydrogen gas in order to remove the oxygen gas. The TaSe3 crystals are heated rapidly from room temperature to 600K and then reacted with hydrogen gas for about 30 min. The chemical reaction is expressed as TaSe3 +H2(gas)=TaSe2+H2Se(gas). One selenium atom is removed from the TaSe3 template per unit cell (TaSe3=TaSe2+Se), resulting in the growth of a TaSe2 thin film on the surface of TaSe3 fibre. The surface TaSe3 crystal is converted into a TaSe2 monolayer near the surface during the de-chalcogenide processes These obtained crystals are suspended in isopropyl alcohol by sonic dispersion of 30 min to strip ultrathin TaSe2 film from TaSe3 surface. The size of the TaSe2 crystals is typically 10nm-10mm (width and length) and 10 nm (thickness). Submicron TaSe2 crystals are deposited on a substrate. We analyze these crystals by their transmission electron diffraction (TED) pattern. We discover a supercluster of electrons in the ultrathin TaSe2 crystals synthesized by our developed de-chalcogenide method. The supercluster has an unexpected structure containing 61 electrons denoted by 61×61, in addition to supercluster based on 7×7 clusters expected in triangle lattices. This new hierarchal structure and successive clustering cannot be explained by a conventional electron clustering mechanism assisted by background lattice distortions, i.e., charge-density-wave formation mechanism based on Fermi surface nesting. We propose an alternative possible formation mechanism based on saddle-point nesting, taking into account a trigonal symmetry as well as lattice distortion energy.

    researchmap

  • 無機物ナノチューブの電子輸走現象

    Grant number:14740196  2002 - 2003

    日本学術振興会  科学研究費助成事業  若手研究(B)

    稲垣 克彦

      More details

    Grant amount:\4,000,000 ( Direct Cost: \4,000,000 )

    無機物ナノチューブの電子輸送特性を調べるために、次の予備実験を行った。
    1)伝導性カンチレバーを用いた原子間力顕微鏡によって試料の電流電圧特性を測定する装置の開発および極低温環境において適している伝導性コート材料の探索を行った。その結果、市販の白金薄膜つきのカンチレバーを用いることでテスト試料のカーボンナノチューブおよびバルクNbSe2単結晶において電流電圧測定が可能であることがわかった。しかし、後者については試料表面に絶縁層が形成されているためにカンチレバーに加える力を1000N程度まで増加させなければ伝導が得られないことが判明した。また、極低温環境においてRFスパッタ法で作成した伝導性カンチレバーの有効性を検討した。
    2)電子ビームリソグラフィーを用いた電極作成技術を確立した。レジストとして高分子量PMMAを用いた標準的な電子ビームリソグラフィーが現有装置の走査型電子顕微鏡を改造することで可能であることを確認した。線幅200nm、膜厚50nmのTi/Au電極を作成し、Si基板上にランダムに振り撒いたNbSe2微結晶に適応した。この試料を4.2Kまで冷却し磁場中において電流電圧特性が測定できることを確認した。

    researchmap

  • Novel devices exploiting collective motion of charge density waves

    2001

      More details

    Grant type:Competitive

    researchmap

  • 電荷密度波の集団励起を利用した新規デバイス

    2001

      More details

    Grant type:Competitive

    researchmap

  • Nanometer scale real-time mapping of vibrations in pico second tempral region

    Grant number:12305007  2000 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    MATSUDA Osamu, INAGAKI Katsuhiko, MUTO Shunichi, WRIGHT B. Oliver

      More details

    Grant amount:\43,500,000 ( Direct Cost: \41,400,000 、 Indirect Cost:\2,100,000 )

    In this research, we aim to develop a new microscope which has both nanometer spatial resolution and picosecond temporal resolution. It can be realized by the combination of the scanning probe microscope and the time-resolved measurement technique with ultrashort laser pulses. The former has the nanometer spatial resolution and the latter the picosecond temporal resolution. The combination of the ultra high speed optical switch with ultra short laser pulses and the scanning tunneling microscope has been already proposed along this way. It is proved, however, that the stray capacity between the sample and the microscope tip substantially reduces the spatial resolution when the tunnel current is switched very fast. As a way getting around the above problem, we propose a scanning probe microscope that detects ultrashort phonon pulses excited by ultrashort laser pulses.
    The ultrashort light pulses from a mode-locked Ti-sapphire laser are divided into two optical paths. An optical delay line is used to introduce a time difference of ± 1 ns between the pulses in two paths. The pulses passing each line are modulated with different frequencies. A metal thin film sample is irradiated by the modulated light pulses to generate the ultrashort acoustic phonon pulses. The generated periodic surface displacement is detected by the atomic force microscopy. We considered this method theoretically and did actual experiments. In addition, we did related studies of the technique to estimate the local elasticity with nanometer spatial resolution by the ultrasonic force microscope and of the ultra high frequency phonon generation by a semiconductor quantum well structure.

    researchmap

  • Ultrasonic-photonic local probe microscopy

    Grant number:11650025  1999 - 2000

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    INAGAKI Katsuhiko, WRIGHT Oliver b.

      More details

    Grant amount:\3,600,000 ( Direct Cost: \3,600,000 )

    We studied ultrasonic-photonic local probe microscopy, designed to image thermoelastic properties of material with nanomater resolution, by exploiting the optical heterodyne of chopped laser illumination and ultrasonic vibration.
    We investigated theoretically the possiblity of the optical heterodyne method, in which a high frequency thermoelastic vibration was converted into a lower frequemcy vibration than the fundamental resonance of the atomic force microscope (AFM) cantilever, and demonstrated experimentally for a patterned multilayer nanostructure, consisting of a region of a 100-nm Cr film deposited on a (100) Si substrate. The sample contained a 150-nm silica film between the Cr and the Si. We obtained several images of the optical heterodyne signals (amplitude and phase) of the sample and compared them with theoretical results. A one-dimensional model of the thermoelastic response of the structure, assuming surface optical absorption correctly predicts that the optical heterodyne amplitude image should show litte contrast. The observed contrast in the phase image, 〜40 degrees, is however, about 10 times larger than that predicted. The discrepancy may be due to a thermal boundary resistance not accounted for in the model.
    We increased excitation ultrasonic frequency in order to improve the resolution of the microscope. We equipped a conventional atomic force microscope with an ultrasonic transducer to apply ultrasonic vibration of radio frequency (frequency f_1〜170 MHz, amplitude<1 nm) to the sample. LiNbO_3 single crystals of the thickness 50 μm and 20 μm were used for ultrasonic transducers. Ultrasonic force microscopy (UFM) allowed us to know if the ultrasonic vibration was successfully applied to the sample. The results of UFM experiments showed that we were able to excite and detect ultrasonic vibration on Ge quantum dots on a Si substrate up to 170 MHz excitation frequencies.

    researchmap

  • Evaluation of local elasticity and inelasticity with nonoscale spatial resolution with scanning ultrasonic force microscope

    Grant number:11555018  1999 - 2000

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B).

    MATSUDA Osamu, INAGAKI Katsuhiko, MUTO Shunichi, WRIGHT Oliver,b, YAMAMOTO Noritaka

      More details

    Grant amount:\12,300,000 ( Direct Cost: \12,300,000 )

    In this research, we develop the scanning ultrasonic probe microscope with lateral resolution < 1 nm and study the physics involved in it. The contributions of elasticity, viscosity, surface energy at the sample-tip interface to the sample and cantilever dynamics are analyzed distinctively in order to carry out the quantitative measurement on the surface and subsurface local complex elasticity.
    A commercial AFM is modified by attaching the PZT transducer at the cantilever base or on the scanner to make the scanning ultrasonic probe microscopy which is capable to apply the ultrasonic vibration to the cantilever or the sample. At various frequency below and above the cantilever resonance frequency and at various ultrasonic amplitude, we carry out the force curve measurement on Si and GaAs single crystals. The vibration amplitude is calibrated with Michelson enterferomenter. The obtained force curve has the following common features : 1)In case of no applied vibration, small "jump-in" in the approach phase and large "jump-out" in the retraction phase are observed. 2)Within creasing the vibration amplitude, the "jump-out" position rapidly approaches to the "jump-in" position. 3)At above certain vibration amplitude, a new "repulsive jump' is observed for both approach and retraction phase.
    These results are analyzed by considering the cantilever motion numerically with the finite difference method. In the analysis, we give the elasticity of the tip and sample, damping, adhesion, and assume the JKR model for the tip-sample interaction. The result explains the features 1)and 2)quantitively and proves the validity of the analysis.

    researchmap

▼display all