Abstract
The role of Ag in the enhancement of J c in YBa 2Cu 3O 7−δ (YBCO) thin films is investigated. Studies show that the concentration of Ag in laser-ablated films made from YBCO targets containing 1–20 wt.% Ag, is less than 0.1%. J c has been found to improve with Ag doping by a factor of 8 in the films which were prepared from targets containing 5 wt.% Ag. A theoretical model based on the reduction in the resistive grain-boundary size is proposed to explain the observed enhancement of J c.
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