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Superconductor

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Superconductor

Details

Inventors: Hatta, Shinichiro; Higashino, Hidetaka; Hirochi, Kumiko; Adachi, Hideaki;
Assignee:
Primary Examiner: Ryan; Patrick J.
Assistant Examiner:
Attorney, Agent or Firm:

Excellent films of a high Tc superconductor are easily produced on metal coated substrates at a temperature below 700.degree. C. These metal buffer films are made of Pt, Au, Ag, Pd, Ni or Ti. The film superconductivity is significantly improved by the metal buffer layer. Since it is easy to form this metal coating on a substrate, the invention can increase the potential number of usable substrates such as fibers, amorphous solids or semiconductors.

DETAILED DESCRIPTION The superconductor according to this invention comprises an oxide film deposited on a metal film formed on a substrate, these oxide containing A, B and Cu and being a ternary (three-element) or quaternary (four-element) compound having an elemental ratio satisfying the following relation: ##EQU1## wherein A is at least one element selected from Tl, Bi, Sc, Y and lanthanum series elements (atomic number: 57-71), and B is at least one elements selected from Ba, Sr, Ca, Be, Mg and Group IIa elements.
The superconductor of this invention is essentially characterized in that a superconductive film is formed on a metal buffer film.
The superconductive film is produced from the sputtering target which is made by breaking down its bare material into very fine powder and depositing such powdery target on a substrate, so that the composition of the formed superconductor film is essentially homogeneous as compared with the conventional sintered materials.
Also, the superconductive film is homogeneously deposited and it becomes dense and flat on a metal film.
Therefore, the present invention can not only realize an extraordinarily high quality superconductor but also increase the potential number of usable substrates, making it possible to obtain a film structure suitable for realizing various types of superconductor devices having superconductive films.

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