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Critical Current Density of Y-Ba-Cu-O Ceramics Prepared by the Coprecipitation Method and their Application to Superconducting Devices

  • Takaaki Ikemachi
  • Minoru Takai
  • Teruhiko Ienaga
  • Toshiaki Yokoo
  • Yorinobu Yoshisato
  • Shoichi Nakano
  • Yukinori Kuwano
Conference paper

Abstract

The effect of the grain boundary formed in the sintering process on characteristics of critical current density (Jc) was investigated. The experiments were performed using samples prepared with a coprecipitated Y-Ba-Cu-O compound at a sintering temperature of 920 °C for 3 ∽ 100 hrs in O2. Though the packing density and superconducting volume fractions of the sample increased with increasing sin-tering time, Jc had a maximum value at a sintering time of around 12 hrs. A maximum Jc of 540 A/cm2 was obtained at 77K in zero field. Moreover, it was found that the magnetic field dependence of Jc which is indicative of “Josephson weak-link current” changed clearly with the sintering time. The temperature denendence of Jc showed that the grain boundary having S-N-S junctions at the initial stage of the sintering process, turned into S-I-S junction during prolonged sintering. Using this Y-Ba-Cu-0 ceramics, granular superconducting devices for optical detection were examined.

Keywords

Sinter Process Critical Current Density High Magnetic Field Solid State Reaction Method Optical Detection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1).
    M. K. Wu, et al., Phys. Rev. Lett., 58, 908 (1987)ADSCrossRefGoogle Scholar
  2. 2).
    D. K. Finnemore, et al., Phys. Rev., B35, 5319 (1987)ADSGoogle Scholar
  3. 3).
    Y. Yoshisato, et al., Seramikkusu Ronbunshi, 96, 459 (1988)CrossRefGoogle Scholar
  4. 4).
    P. G. de Gennes, Rev. Mod. Phys., 36, 226 (1964)Google Scholar
  5. 5).
    V. Ambegaokar and A. Baratoff, Phys. Rev. Lett., 10, 486 (1963)ADSCrossRefGoogle Scholar
  6. 6).
    T. Van Duzer and C. W. Turner, “Principles of Superconductive Devices and Circuits” (Elsevier, New York 1981), Chap. 4.Google Scholar
  7. 7).
    A. Barone and G. Paterno, “Physics and Applications of the Josephson effect” (John Wiley & Sons, New York 1982), Chap. 4.CrossRefGoogle Scholar

Copyright information

© Springer Japan 1989

Authors and Affiliations

  • Takaaki Ikemachi
    • 1
  • Minoru Takai
    • 1
  • Teruhiko Ienaga
    • 1
  • Toshiaki Yokoo
    • 1
  • Yorinobu Yoshisato
    • 1
  • Shoichi Nakano
    • 1
  • Yukinori Kuwano
    • 1
  1. 1.Functional Materials Research CenterSanyo Electric Co., Ltd.Hirakata, Osaka, 573Japan

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