Abstract
By means of the activated reactive evaporation (ARE), single-crystal thin films of YBa 2 Cu 3 O 7−x with its c axis perpendicular to the substrate plane have been directly and epixtaxially grown on the (100) surface of SrTiO 3 . The substrate temperature was kept below 600°C and the oxidation treatment was performed below 500°C. The ac-resistive measurement for a film 1500A thick showed a sharp superconducting transition whose end point was 90.2K and AT (10–90%)=1.7K. The Meissner effect as well as the structural uniformity of the specimen were confirmed from the complex susceptibility measurements.
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