Substrate material and method for the preparation of oxide superconductors.

摘要

A substrate material for the preparation of an oxide superconductor comprises two different rare earth elements A' and A'' in the IIIa group, Ga, and O, the atomic ratio of these elements being expressed as A'1-xA''xGaO3 (where 0<x<1), and a mixed crystal material forming a perovskite-type structure having a composition of AGaO3 with A being at least one of the two rare earth elements A' and A'' in the IIIa group. A method for the preparation of the oxide superconductor, or a semiconductor, comprises forming an intermediate layer of a mixed crystal material of two different rare earth elements A' and A'' in the IIIa group, Ga, and O. The atomic ratio of these elements is expressed as A'1-xA''xGaO3 (where 0<x<1) and the mixed crystal material has a perovskite-type structure whose composition is AGaO3 with A being at least one of the two rare earth elements A' and A'' in the IIIa group.