| 摘要 |
PURPOSE:To prevent superconducting characteristic from deteriorating by forming of a tunnel type Josephson element made of an oxide superconductor, a blocking layer formed by coating the surface with a metal hard to be coupled with oxygen, an insulator thin film layer formed thereon, and other superconductor electrode covering thereon. CONSTITUTION:In case that other superconductor 4 is approached through a thin insulating film 3 on an oxide superconductor 1 to form a Josephson element, when the film 3 is deposited on the superconductor 1, the characteristic of a superconductor electrode is remarkably deteriorated by the reaction with the superconductor 1 of the electrode material with the film 3, and a superconducting current is not observed, and a a resistance between both electrodes becomes very high. On the other hand, before the insulating film is deposited, metal hard to be oxidized, such as Au is used to form a blocking layer 2 on the superconductor 1, and the film 3 is then deposited. Then, it can prevent the superconductor 2 from reacting directly with the film 3. Accordingly, the superconducting characteristic of the electrode is not deteriorated. The blocking layer includes stable metal, such as Au, Pt, Ag, Cu which does not relatively form an oxide.
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