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VOLUME 59 (1994) | ISSUE 3 | PAGE 159
Anomalous behavior of the critical current of a grain-boundary Josephson junction in a bulk (Ba,K)BiO3 bicrystal
The electrical transport properties of grain boundaries in bulk bicrystals of the oxide superconductor Bao 55K0 45Bi03 have been studied. The grain boundary in these bicrystals is a Josephson barrier. Near the transition temperature, the critical current of this barrier has a power-law temperature dependence with a critical exponent of 3/2. The critical current of a grain boundary exhibits a nonmonotonic behavior as the temperature is lowered. A possible interpretation of this behavior is discussed.