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1992 Fiscal Year Final Research Report Summary

Investigation of Proximity Effects between Normal Metal and Superconductor through Transmission Electron Spin Resonance and Microwave Magnetoabsorption

Research Project

Project/Area Number 03650024
Research Category

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

Allocation TypeSingle-year Grants
Research Field Applied materials
Research InstitutionFukuoka University

Principal Investigator

NISHIDA Akihiko  Fukuoka Univ., Dept. Appl. Phys., Assoc. Prof., 理学部, 助教授 (90131838)

Project Period (FY) 1991 – 1992
KeywordsTESR / Microwave Absorption / Cuprate superconductor / Rietveld Analysis / Flux Pinning / Logarithmic Relaxation / Viscous Flux Motion / 2D Flux Lattice
Research Abstract

The results of this project, regarding the interaction between superconductors and resonant / non-resonant microwaves as an woof, is summarized below.
(1) Fabrication of a simple resistivity cryostat and Y- and Bi- based high-T_c superconductors resulted in a fairly satisfying source material for electron-beam evaporation in YBCO case. In BSCCO case, however, there remained some problems for improving homogeneity of oxygen concentration within the sample.
(2) Close correlations among sintering conditions, oxygen contents and superconducting qualities have been confirmed mainly in YBCO through X-ray diffraction and Rietveld analyses. This has been one step towards studies of correlation between flux-pinning defects and oxygen deficiency.
(3) The necessity of rather sharp transition of superconductivity as well as moderate coupling between normal metal and superconductor has been pointed out for the distinct proximity effect to be clearly observed through measurements of the transmission el … More ectron spin resonance.
(4) The detailed observations of the microwave magnetoabsorption have shown that superconductivity in the Tl-based cuprate is quasi-two dimensional similar to the Bi-based cuprate. The observed logarithmic relaxations in the remanent absorption after H_<FC> field cooling and in the magnetoabsorption under existing field H_a provided estimations of the flux pinning potential U_O which scaled as U_O alpha H^<-1/4>_ and as U_O alpha H^<-1/2>_, respectively. These observations are consistent with the microwave irreversibility measurements with U_O alpha B^<-1/2> dependence which originates in the two-dimensional flux lattice model. Decaying process of the in-field microwave absorption further suggested that the absorption in larger applied field is closely correlated with magnetization |M| rather than flux density B. Further investigations on the interactions between microwaves and superconductors will be continued in the future project accompanied by magnetization measurements in the same samples. Less

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Akihiko NISHIDA: "Scaling Behavior in the Irreversibility of T1_2Ba_2Ca_2Cu_3O_<10> Supercnduc-tors Investigated through Microwave Absorption" Solid State Communications. 79. 259-263 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Akihiko NISHIDA: "Flux Pinning and Logarithmic Relaxation of Microwave Remanent Ab-Sorption in Superconductiong T1_2Ba_2Ca_2Cu_3O_<10>" Physica C. 185-189. 2153-2154 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nobuhiro FUKETA: "Fabrication of a Simple Resistivety Cryostat and Measurements on Y-based High-T_C Copper Oxide Superconductors" Fukuoka University Science Reports. 22. 107-118 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Akihiko NISHIDA: "In-field Logarithmic Relaxation of Microwave Absorption in Supercon-ducting T1_2Ba_2Cu_3O_<10> and Flux Pinning Properties" Solid State Communications. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Akihiko NISHIDA: "Examinations on Crystallographic Quality, Superconducting Transition Width and Oxygen Deficiency in YBa_2Cu_3O_<7-δ>" Japanese Journal of Applied Physics. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Nishida, K.Shiiyama, T.Fujita, H.Shibayama, K.Iwahashi and K.Horai: "Scaling Behavior in the Irreversibility of Tl_2Ba_2Ca_2Cu_3O_<10> Superconductors Investigated through Microwave Absorption" Solid State Commun. Vol.79. 259-263 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Nishida, K.Shiiyama, T.Fujita, H.Shibayama, K.Iwahashi and K.Horai: "Flux Pinning and Logarithmic Relaxation of Microwave Remanent Absorption in Superconducting Tl_2Ba_2Ca_2Cu_3O_<10>" Physica C. Vol.185-189. 2153-2154 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Fuketa, K.Furuya, A.Nishida and K.Horai: "Fabrication of a Simple Resistivity Cryostat and Measurements on Y-based High-T_c Copper Oxide Superconductors" Fukuoka Univ.Sci.Rep.Vol.22. 107-118 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Nishida and K.Horai: "In-field Logarithmic Relaxation of Microwave Absorption in Superconducting Tl_2Ba_2Ca_2Cu_3O_<10> and Flux Pinning Properties" Solid State Commun. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Nishida, N.Fuketa, K.Furuya and H.Horai: "Examinations on Crystallographic Quality, Superconducting Transition Width and Oxygen Deficiency in YBa_2Cu_3O_<7-delta>" Jpn.J.Appl.Phys. (1993)

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

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Published: 1994-03-24  

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