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Y-Ba-Cu-O thin films were prepared by an RF magnetron sputtering technique. When annealed at temperatures between 920°C and 1000°C the crystal structures of these films are orthorhombic, while when annealed at 1010°C the structures are tetragonal. Superconductivity can be observed for the orthorhombic films. Their critical temperature ( T c ) of superconducting becomes higher as the a -axis becomes shorter, and is independent of the b -axis value.
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Komuro et al. (1987) studied this question.
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