Other

Tsuyoshi Sugano

Nobuyoshi Inoue

Keiichi Tanabe

Seiji Adachi

A superconductor having at least one Hg&mdash;M&mdash;Cu&mdash;O (M&equals;Ba, Sr and/or Ca) superconducting film provided on a substrate and having a thickness of between 300 &angst; to 950 &angst;. The superconductor may be prepared by forming, on a substrate, a precursor laminate composed of a first, M&mdash;Cu&mdash;O film and a second, Hg&mdash;O film. The precursor laminate film-bearing substrate is placed in a closed vacuum chamber together with a first pellet of HgO, MO and CuO and a second pellet of MO and CuO. The contents in the chamber are heated to form, on the substrate, a superconducting Hg&mdash;M&mdash;Cu&mdash;O film. The thickness of the first M&mdash;Cu&mdash;O film of the precursor is controlled so that the thickness of the superconducting Hg&mdash;M&mdash;Cu&mdash;O film is in the range of between 300 &angst; to 950 &angst;.

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Tokyo, Japan

Tsuyoshi Sugano