Superconducting Properties of Li-Doped Bi₂Sr₂CaCu₂O_x hick and Thin Films

Abstract

The effect of Li addition to Bi₂Sr₂CaCu₂O_x thick and thin films on their superconducting properties was investigated. Bi₂Sr₂CaCu₂O_x superconducting films were successfully obtained at low temperatures below 840°C by addition of Li₂CO₃, which acted as a flux. The superconducting transition temperature (T_c) of films increases with increases in Li content, accompanied with an increase of the length of c-axis. The thick and thin films show T_{c zero} of 88 K and 81 K, respectively, which are higher than that of undoped Bi₂Sr₂CaCu₂O_x.