Abstract
A rather detailed analytical treatment of the influence of silver addition on weak-link properties of high- T c ceramics is presented within the superconductive glass model. It is shown that for small concentration of silver p (< p c ) the coherent properties of the Josephson junction (JJ) network are improved resulting in essential enhancement of intergrain superconducting parameters (such as T c , I c , and H c ). Further increase of silver leads to their degradation. The critical content of silver, p c , is found to depend on a competition between tunneling and proximity characteristics of the initially undoped ceramics. It is shown also that the compression effect increases with silver doping resulting in a weaker field dependence of the intergrain critical current. The obtained results are in qualitative agreement with the experimental data for high- T c superconductors.
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