Electrical measurements in high T c Bi-Sr-Ca-Cu-O thin films

Abstract

Electrical measurements were performed on polycrystalline thin films of the high T_c Bi‐Sr‐Ca‐Cu‐O system. The resistance of the superconducting state was confirmed to be smaller than 10⁻⁸ Ω cm at 100 K. It is confirmed directly that the critical current density at 77 K was in excess of 10⁵ A/cm² and the dependence of critical current on temperature was able to be represented approximately by (1−T/T_c )².