Patent ID: 7981840

Claim:
A method of manufacturing a Bi-based oxide superconductor thin film having a c-axis parallel to a (110) or (10-10) crystal plane of a substrate and one of a-axis and b-axis being oriented perpendicular to the (110) or (10-10) crystal plane of the substrate, the method comprising the steps of: depositing the oxide superconductor film on a vicinal substrate selected from the group consisting of LaSrAlO 4 , LaSrGaO 4 , α-Al 2 O 3 and NdAlO 3 , while supplying oxygen, wherein the depositing includes heteroepitaxially growing the one of a-axis and b-axis oriented oxide superconductor thin film at a first temperature, and then homoepitaxially growing the oxide superconductor thin film on the heteroepitaxially grown film at a second temperature which is higher than the first temperature, wherein a lattice constant of the crystal plane of the superconductor thin film is an approximate integer multiple of a lattice constant of the crystal plane of the substrate and the oxide superconductor thin film is Bi 2 Sr 2 Ca 2 Cu 3 O 10+X (where X is a positive number less than unity) or Bi 2 Sr 2 CuO 6+Y (where Y is a positive number less than unity) thin film.