Patent ID: 7985712

Claim:
A rare earth oxide superconductor comprising: a metal substrate; an intermediate layer formed on the surface of the metal substrate by sequentially disposing: a first intermediate cerium-based oxide layer consisting essentially of cerium and one or more solid solution formation elements, selected from the group consisting of Y, Nd, Sm, Gd, Eu, Yb, Ho, Tm, Dy, La and Er, which are capable of forming a solid solution with cerium, and a second intermediate cerium-based oxide layer, different from the first intermediate cerium-based oxide layer and consisting essentially of cerium and one or more charge compensation elements, selected from the group consisting of Bi, Nb, Sb, Ta and V, which are capable of compensating for a charge mismatch attributable to a difference between the electron valences of respective ions of cerium and the solid solution formation element, wherein the total of the solid solution formation element and the charge compensation element in the intermediate layers is 5 to 60 mol % in terms of the metal content; and a rare earth oxide superconductive layer formed on the intermediate layer and having a critical temperature (Tc) of 85-88° K.