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We calculate the transport critical-current density in a granular superconductor in magnetic fileds below about 5 x 10^-3 T. The field dependence in this region is assumed to be controlled by intragranular or intergranular Josephson junctions. Various
A high-pressure reactive evaporation process has been used to produce smooth YBa2Cu3O7-y high Tc superconducting films without the necessity of a post-deposition oven anneal cycle. Augmented in some cases by rapid thermal annealing, the process has yielded