High temperature superconducting thin oxide film on a crystal defect of nano-scale method for introd

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PROBLEM TO BE SOLVED : To provide a simple method for introducing a controlled crystal defect in a (RE)BCO thin film.SOLUTION : On top of a high temperature superconducting oxide thin film, deposited on a substrate, which consists primarily of a rare earth oxide expressed by a general formula (RE)BaCuO(where, RE represents one kind of atom selected from Y, Nd, Sm, Eu, Gd, Dy, Ho, Er and Yb) is placed a porous alumina self-supporting film. And, by using the alumina film as a mask, argon ion milling is applied, whereby a nano-scale crystal defect is introduced into the high temperature superconducting oxide thin film.