Formation of Superconducting Y-Ba-Cu-O Thin Films by the Solid Phase Reaction between BaCo3/Cu/Y2O3 Layers on Single Crystalline SrTiO3 Substrate

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Thin films of superconducting Y-Ba-Cu-O were formed on single crystalline SrTiO3 substrate by the solid phase reaction between BaCO3/Cu/Y2O3 layers. The layers were evaporated on the substrate by an electron-beam gun and heated at 900°C in oxygen atmosphere for an hour. Resistivities of the films were measured by the four-probe method and superconduction was observed at Tc=90 K (onset) and 50 K (end).