Critical Currents in High T sub c Superconductors

This paper reviews some of the recent investigations of critical current behavior in various high T sub c superconductors such as Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O, Tl-Ba-Ca-Cu-O, and Ba-K-Bi-O. 

In spite of the tremendous interest and research effort, the progress toward major applications of the bulk high-temperature superconductors has been impeded by, among other things, the low critical currents and their severe deterioration in weak magnetic fields.