Josephson device comprising an oxide superconductor multilayered film

摘要

An oxide superconducting multilayered thin film structure having a laminated layer structure of oxide superconductor thin film layers (1) and non-superconductor thin film layers (2) constituted by a combination of material groups for making strain free interfaces among both thin film layers (1,2). For example, an oxide superconductor multilayered film constituted by a laminated layer structure where thin films (1) of an oxide superconductor represented by the chemical formula of M'Ba2Cu3O7- delta (M'; a rare earth element of Nd, Sm, Eu or the like or an alloy of these, delta ; oxygen depletion amount) and thin films (2) of an oxide represented by the chemical formula of M*Ba2Cu3O7- delta (M*; an element of Pr, Sc or the like or an alloy of these, delta ; oxygen depletion amount) are alternately stacked. The oxide thin films (1, 2) are thin films fabricated by a pulsed laser deposition process or a sputtering process. A Josephson device can be provided by using the multilayered film (1, 2).