An Effect of Substitution on the Superconductive Property in Perovskite-Like Oxides

Abstract

Abstract The critical temperature, Tc, of YBa2Cu3O7-δ was lowered by the partial substitution of Nb, Mo, Al, Zr, Bi, Sn, Ti and In for Cu. With a decrease in Tc, lattice parameter a increased, but lattice parameter b was almost constant. The superconductive property of Bi2Sr2CaCu2O9-δ samples was significantly affected by the preparation condition and by cation substitution. With an increase in Gd substitution for Ca, the oxygen content increased, which also accompanied a decrease in Tc. The lattice parameter c decreased with an increase in the oxygen content. In various Bi2Sr2CaCu2O9-δ-based samples, the critical temperature tended to increase with an increase in lattice parameter c.