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 language | English |
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Pages (from-to) | 13-19 |
Number of pages | 7 |
Journal | Physica C: Superconductivity and its applications |
Volume | 193 |
Issue number | 1-2 |
DOIs | |
State | Published - 1 Apr 1992 |