Alumina is formed on the surface of the single crystal substrate made of thin superconductor, the s

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PROBLEM TO BE SOLVED : To form an epitaxial thin film comprising a rare earth metal and aluminum on the surface of an alumina single crystal substrate by dissolving a rare earth oxide and an aluminum-containing compound into a solvent, then stirring the mixture to obtain a uniform solution, coating the solution on the surface of the alumina single crystal, drying to form a thin film and heating/ firing the coated film, and to form a superconducting film on the single crystal alumina substrate by forming the superconducting film on the surface of the epitaxial thin film mentioned above, being used as an intermediate layer. SOLUTION : The epitaxial thin film of a multiple oxide having a compositional ratio of rare earth metal : aluminum : oxygen of 1 : 1 : 3 is obtained by dissolving a compound containing a rare earth metal into a solvent, then stirring the mixture to obtain a uniform solution, coating the solution on the surface of an alumina single crystal substrate, drying to form a thin film and heating/firing the coated thin film. The superconductor is constituted of a YBa2 Cu3O7 yttrium-based superconductor epitaxial thin film.