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1992 Fiscal Year Final Research Report Summary

STUDY ON THE DYNAMICS OF THE SPIN-DENSITY WAVES

Research Project

Project/Area Number 03650004
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Applied materials
Research InstitutionTHE UNIVERSITY OF TOKYO

Principal Investigator

MAEDA Atustaka  DEPARTMENT OF PURE AND APPLIED SCIENCES,THE UNIVERSITY OF TOKYO,ASSOCIATE PROFESSOR, 教養学部, 助教授 (70183605)

Co-Investigator(Kenkyū-buntansha) TERASAKI Ichiro  DEPARTMENT OF APPLIED PHYSICS,THE UNIVERSITY OF TOKYO, 工学部, 助手 (30227508)
Project Period (FY) 1991 – 1992
KeywordsSpin-denstiy waves / Quasi-one dimensional materials / Sliding motion / Dynamical coherence volume / Nonlinear conduction / Conduction noise / Collective mode / Organic couductor
Research Abstract

1) We systhesized single crystals of (TMTSF) _2PF_6 by an electrochemical method. They were found to be the very materials by X-ray diffraction technique.
2) We measured the electric-field dependence of the conductivity in the spin-density wave (SDW) state, and confirmed a nonlinear conduction above a finite threshold field of 20 mV/cm.
3) In the nonlinear regime where the SDW is sliding, we performed the low-frequency broadband noise measurement for the first time. We found a broad peak in the electric field dependence of the noise just above the threshold field of the nonlinear conduction. From these broadband noise data, we can estimated the dynamical coherent volume for the sliding of the SDW for the first time. It was found that the dynamical coherent volume of the SDW is as large as that of the charge-density waves (CDW's) in the quasi-one dimensional mateirals.
4) We constructed the conductivity measurement system in the microwave frequency region, to measure the complex conductivity of the sliding SDW.Although the application to the SDW systems have not been performed yet, we got many interesting results in the superconducting state of the high-T_c cuprate, using the same system.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] A.MAEDA: "Dynamical cohence volume of spin-density waves of (TMTSF) _2PF_6" Synthetic Metals. (印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.MAEDA: "Magnetic-field-penetration depth and the lower critical field of the guasi-one dimensional superconductor Bi_2Sr_2CaCu_2O_y" Physical Review B. 46. 14234-14237 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Shibauchi: "Microwave complex conductivity in single crystals of YBa_2Cu_3O_y and Bi_2Sr_2CaCu_<>O_y" Physica C. 203. 315-319 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Shibauchi: "Anisotropic penetration depth in La_<2-x>SR_xCuO_4" Physical Review Letters. 72. 2263-2266 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Shibauchi: "Microwave Properties perpendicular to the CuO_2Planes" Physica C. 印刷中. (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kitano: "C-Axis microwave conducting of YBa_2Cu_3O_<7-8>" Physical Review B. (印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Maeda, H.Kitabayashi, K.Uchinokura, A.Kitamura, T.Hanaguri, H.Mori, I.Hirabayashi, and S.Tanaka: "Dynamical coherence volume of spin-density waves of (TMTSF) _2PF_6" Synthetic Metals. (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Maeda, T.Shibauchi, N.Kondo, K.Uchinokura and M.Kobayashi: "Magnetic-field-penetration depth and the lower critical field of the quasi-two dimensional superconductor Bi_2Sr_2CaCu_2O_y" Phys.Rev.B. 46. 14234-14237 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shibauchi, A.Maeda, H.Kitano, T.Honda and K.Uchinokura: "Microwave complex conductivity in single crystals of YBa_2Cu_3O_7 and Bi_2Sr_2CaCu_2O_y" Physica C. 203. 315-319 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shibauchk, H.Kitano, K.Uchinokura, A.Maeda, T.Kimura, and K.Kishio: "Anisotropic penetration depth in La_<2-x>Sr_xCuO_4" Phys.Rev.Lett.72. 2263-2266 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shibauchi, H.Kitano, A.Maeda, T.Tamegai, K.Uchinokura, T.Kimura, K.Kishio, H.Asaoka, and H.Takei: "Microwave preperties perpendicular to the CuO_2 planes" Physica C. (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kitano, T.Shibauchi, K.Uchinokura, A.Maeda, H.Asaoka, and H.Takei: "c-Axis microwave conductivity of YBa_2Cu_3O_<7-delta> in the superconducting state" Phys.Rev.B. (submitted).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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