Anomalous pinning behavior in slightly-oxygen-deficient Ba2YCu3O7-δ

R. B. van Dover, L. F. Schneemeyer, R. J. Felder, J. V. Waszczak

Research output: Contribution to journalArticle

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Abstract

Single crystals of Ba2YCu3O7-δ were equilibrated at ∼400-500°C to obtain δ∼0.05-0.15, with Tc87-83 K, respectively. Despite the consequent increase in point defects, the field-broadened resistive transition (B|c) ofhe crystal with Tc∼83 K indicates a marked reduction in the pinning energy compared with the fully oxidized case. The c-axis coherence length, inferred from the fluctuation conductivity, does not change. We speculate that the pinning energy decrease is due to a decrease in coupling between superconducting CuO planes due to proximity-effect reduction of the order parameter on CuO chains.

Original languageEnglish
Pages (from-to)13-19
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume193
Issue number1-2
DOIs
StatePublished - 1 Apr 1992

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