The Chugoku Electric Power Co., Inc.

International Superconductivity Technology Center, the Juridical Foundation

Hitachi, Ltd.

Fujitsu Corporation

Koji Tsubone

Hironori Wakana

Keiichi Tanabe

Yoshinobu Tarutani

Yoshihiro Ishimaru

Seiji Adachi

A superconducting junction element has a lower electrode formed by a superconductor layer, a barrier layer provided on a portion of a surface of the lower electrode, an upper electrode formed by a superconductor and covering the barrier layer, and a superconducting junction formed by the lower electrode, the barrier layer and the upper electrode. A critical current density of the superconducting junction is controlled based on an area of the lower electrode.

Superconducting junction element and superconducting junction circuit

A Josephson device includes a first superconducting electrode layer, a barrier layer and a second superconducting electrode layer that are successively stacked. The first and second superconducting electrode layers are made of an oxide superconductor material having (RE)(AE)CuOas a main component, where an element RE is at least one element selected from a group consisting of Y, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu, and an element AE is at least one element selected from a group consisting of Ba, Sr and Ca. The barrier layer is made of a material that includes the element RE, the element AE, Cu and oxygen, where in cations within the material forming the barrier layer, a Cu content is in a range of 35 At. % to 55 At. % and an RE content is in a range of 12 At. % to 30 At. %, and the barrier layer has a composition different from compositions of the first and second superconducting electrode layers.

Josephson device, method of forming Josephson device and superconductor circuit

Growing community of inventors

Tokyo, Japan

Koji Tsubone