| abstract |
The present invention provides an oxygen-deficient perovskite type oxide superconductor having a superconducting critical temperature of 90 K or higher and represented by the formula of A-B-C-D, for example, A₁B₂C₃D 7-δ , wherein A is at least one of yttrium and rare earth metals of Atomic Numbers 57 to 71, except for Atomic Number 61, B is at least one of alkaline earth metals selected from barium, calcium and strontium, C is copper and D is oxygen, the oxide superconductor containing at least one of elements of Atomic Numbers 81 to 83 substituted for part of A. |