Abstract
The effects of oxygen annealing on critical currents in YBa 2 Cu 3 O 7−δ ceramics have been studied by measuring the critical current as a function of temperature. The transport critical currents in samples subjected to different annealing conditions were measured in a high heat transfer system. Weak links in the ceramic samples have been identified as SNS (superconductor-normal conductor-superconductor) junctions. Different I c - T characteristics have been observed in the superconducting ceramics. An I c - T characteristic of I c ∝( T c - T ) 2 exists in samples sintered in air. The I c - T characteristics of well oxygen annealed samples can be fit well to the Josephson tunneling model. Transitions from a quadratic temperature dependence of critical currents to a Josephson type of temperature dependence have been observed in the samples, and these transitions are correlated to the oxygen annealing conditions. Possible mechanisms for the effects of oxygen annealing on the critical currents are discussed.
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