Anomalous Pinning Behavior in Slightly-Oxygen-Deficient Ba2YCu3O7-Δ
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.
MSU Digital Commons Citation
van Dover, R. B.; Schneemeyer, Lynn; Felder, R. J.; and Waszczak, Joseph V., "Anomalous Pinning Behavior in Slightly-Oxygen-Deficient Ba2YCu3O7-Δ" (1992). Department of Chemistry and Biochemistry Faculty Scholarship and Creative Works. 272.