High T_c Superconductivity of Sr–La–Cu–O and Ba–Y–Cu–O Thin Films

Abstract

High Tc Sr–La–Cu–O and Ba–Y–Cu–O thin films have been successfully prepared by the magnetron sputtering method. The Tc onsets for Sr–La–Cu–O are 25–30K and Δ Tc are 7.5–8.5K. The slope near Tc is 3.05T/K. The Tc onsets of Ba–Y–Cu–O thin films are 87–89.5K and the zero resistance is at 20K. The samples are diamagnetic and the Meissner effect appeared around 10K.