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The Effect of Anisotropy in Hc2 on the Breadth of the Resistive Transition of Polycrystalline YBa2Cu3O7−x in a Magnetic Field

  • D. O. Welch
  • M. Suenaga
  • T. Asano

Abstract

Previous studies have shown that an applied magnetic field severely broadens the transition to the superconducting state in polycrystalline YBa2Cu3O7−x and La2CuO4-based superconductors. Two possible sources of this broadening are the poor superconducting properties of the intergranular material in these granular superconductors and the anisotropy in the upper critical field Hc2 arising from the layered nature of their crystal structures. Both factors can cause low values of the critical current density in magnetic fields for polycrystals, but whereas the effect of granularity can in principle be removed by proper processing, the effect of anisotropy is intrinsic and can severely limit the usefulness of randomly oriented polycrystals if the anisotropy is large enough.

Keywords

Applied Magnetic Field Percolation Threshold Critical Current Density Critical Field Superconducting State 
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References

  1. 1.
    D. O. Welch, M. Suenaga, and T. Asano, Phys. Rev. B, to be published in the August 1, 1987 issue.Google Scholar
  2. 2.
    H. Teichler, in Anisotropy Effects in Superconductors, H. W. Weber, Ed., p. 7, Plenum Press, New York, 1977.Google Scholar
  3. 3.
    A. Davidson and M. Tinkham, Phys. Rev. B 13, 3261 (1976).Google Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • D. O. Welch
    • 1
  • M. Suenaga
    • 1
  • T. Asano
    • 2
  1. 1.Materials Science DivisionBrookhaven National LaboratoryUptonUSA
  2. 2.National Research Institute for MetalsTsukuba, IbarakiJapan

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