Abstract
Magnetization and magnetic relaxation measurements have been studied at 4.2 K on YBa2Cu3O7−δ:Ag x (x=0 to 1.2) superconducting samples prepared by a coprecipritation technique. Remanent magnetization and hysteresis loops were found to be increased on Ag addition. Transport current density (J c) was enhanced with the addition of Ag concentration. Flux creep rate was also increased with increase in Ag addition resulting in stronger pinning potential. Microwave-induced d.c. voltage measurements show a reduction of weak links with increase in Ag concentration. The enhancement of transportT c is attributed to the stronger Josephson current paths due to the reduction of the total number of weak links after Ag addition.
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