Title

Anomalous Pinning Behavior in Slightly-Oxygen-Deficient Ba2YCu3O7-Δ

Document Type

Article

Publication Date

4-1-1992

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.

DOI

10.1016/0921-4534(92)90862-7

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