Josephson junction device formed of oxide superconductor and process for preparing the same

U.S. Patent Number: 5382566

Abstract: A Josephson junction device comprising a single crystalline substrate including principal surface, a layer of the same material as the substrate formed on the principal surface of the substrate so as to form a step on the principal surface, and an oxide superconductor thin film formed on the principal surface of the substrate. The oxide superconductor thin film includes a first and a second superconducting portions respectively positioned above and below the step, which are constituted of single crystals of the oxide superconductor, a junction portion between the first and the second superconducting portions, which is constituted of a single crystal of the oxide superconductor of which crystal orientation is different from those of the first and second superconducting portions, and grain boundaries between the first superconducting portion and the junction portion and between the second superconducting portion and the junction portion, which constitute one weak link of the Josephson junction.

Inventors: Tanaka; Saburo (Hyogo, JP), Matsuura; Takashi (Hyogo, JP), Itozaki; Hideo (Hyogo, JP)

Assignee: Sumitomo Electric Industries, Ltd. (Osaka, JP)

Application Number: 08/069,912

Issued: 1995-01-17

Expired: 2007-01-17

Classes: 505/329 ; 505/817

Field of search: 257/33,34 505/1,729,730,731,832 156/630 437/944,99

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