Abstract
Thin films of Bi2(Sr, Ca)3Cu2Oy have been prepared in situ by a molecular beam epitaxy technique in an ozone atmosphere of 4×10-4 Pa. The molecular beams were shutter controlled and films were deposited layer by layer. In situ reflection high energy electron diffraction (RHEED) showed the formation of the perovskite-related structure even at the initial deposition (one unit cell). The resistance of one of the films became zero at 30 K without heat treatment in oxygen.
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