Critical current characteristics in melt-processed Y-Ba-Cu-O superconductor

Abstract

A rapid decrease in Jc with elevating temperature was recently observed in melt-processed Y-Ba-Cu-O at low temperatures. This suggests an existence of weak links in this material. In order to investigate weak link property in this material, the history effect of Jc and Jc in the longitudinal field geometry were measured. These measurements suggest that weak link property in this material is quite different from those at grain boundaries in polycrystalline materials.