Abstract
Abstract We use the Deutscher-Muller model of depressed order-parameter Josephson junction coupling [1] to describe the HTSC ceramics, modeling them as simple granular superconductors. The low critical current density of the ceramics ( J c ≈10 3 A/cm 2 ) can thus be understood within the framework of a simple model of grains, which are coupled by Josephson junctions with depressed order-parameters. An explicit solution for the gap equations is given, and typical numerical values are computed for YBCO, showing good agreement with experimental data.
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