Differential resistance and critical-current distribution in YBa2Cu3O7x ceramics

E. Babić, M. Prester, N. Bikup, Ž. Marohnić, and S. A. Siddiqi
Phys. Rev. B 41, 6278 – Published 1 April 1990
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Abstract

V-I curves of several Y-Ba-Cu-O samples have been measured in the temperature range 77–91 K in weak magnetic fields (H<150 Oe). For the well prepared low-resistivity samples Rf==dV/dI reaches a value of about 0.1Rn (Rn is the normal resistance just above transition) in the linear V-I regime. This is consistent with a picture of decoupled superconducting grains and does not yield any direct information about the flux-flow effects. Because of self-field effects, critical-current density (Jc) obtained from transport (and magnetization) measurements does not provide clear insight on the nature of intergrain coupling. Information on the distribution of critical currents, obtained from d2V/dI2, supports the tunneling and/or proximity-effect coupling between the grains and seems to rule out large enhancements of Jc in sintered samples with nonoriented grains.

  • Received 23 October 1989

DOI:https://doi.org/10.1103/PhysRevB.41.6278

©1990 American Physical Society

Authors & Affiliations

E. Babić

  • Department of Physics, Faculty of Science, University of Zagreb, P.O. Box 162, YU-41 001 Zagreb, Croatia, Yugoslavia

M. Prester, N. Bikup, and Ž. Marohnić

  • Institute of Physics, University of Zagreb, P.O. Box 304, Zagreb, Croatia, Yugoslavia

S. A. Siddiqi

  • Instituto di Chimica, Applicata e Industriale, Universita di Trieste, 34127 Trieste, Italy

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Vol. 41, Iss. 10 — 1 April 1990

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