Properties and Application of High Ic Bi Based Oxide Superconductors Prepared by Laser Pedestal Growth Method

Bi2Sr2Ca1Cu2Ox Superconductors were prepared by laser pedestal growth method. Annealing conditions were investigated to increase Jc and the diameter dependence of Ic was studied to increase Ic. The best annealing condition was 840° C*more than 500 hours. When the diameter was 3.0mm, Ic=500A was obtained. Also, electric current was applied to a sample in liquid helium or with the one electrode of a sample in liquid helium and another over liquid helium as a current lead situation. Oxide superconductor will be thought to be useful for current lead on a superconducting magnet in liquid helium. The possibility of application for it was investigated. In liquid helium, 1000A current could be applied without quenching. But in current lead situation, there was increasing of the generated voltage at the upper electrode with more than 450A current.