Abstract

Effects of silver doping on critical current density in the bulk superconductor Y-Ba-Cu-O system are investigated by measuring the variation of critical current density in low magnetic fields. Below a newly defined characteristic field value Hc’, the critical current is mainly controlled by intergranular effects due to Josephson weak-link coupling. This field Hc’, which signifies a crossover between regions dominated by inter- and intra-granular effects, is found to vary with the silver content. An optimum enhancement of both the critical current density and Hc’ is obtained with silver doping around 5 – 10%. These results lend direct support to the interpretation that the Josephson coupling is enhanced due to the presence of silver atoms along the grain boundaries in the material.

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