Preparation of High-T_c Bi-Sr-Ca-Cu-O Films on MgO Substrates by the Liquid Phase Epitaxial (LPE) Method

Abstract

Thin films of high- T c superconductor Bi 2 Sr 2 CaCu 2 O x were prepared on MgO(100) substrates by a liquid phase epitaxial method. Several kinds of fluxes were applied for preparation of Bi 2 Sr 2 CaCu 2 O x thin films, and KCl was found to be the best among them. The film consisted of two phases, Bi 2 Sr 2 CaCu 2 O x and Bi 2 Sr 2 CuO x . The onset T c in the superconducting transition was at 95 K in an as-grown state, but zero resistivity was not observed over 50 K.