Simultaneously, La 2 O 3 was heated at about 2,400° C., SrCO 3 was heated at about 2,200° C., and CuO was heated at about 980° C. by electron beam.
The materials were evaporated towards the substrate and deposited on the substrate to form a thin film of La-Sr-Cu-O type ceramic oxide superconductor having a thickness of about 1 μm.