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Superconducting Bi-Sr-Ca-Cu-oxide thin films were prepared by sequential evaporation of two layers of Ca/Cu and Bi/Sr on single-crystal SrTiO3 substrates followed by a two-step oxidation process. The film properties were found to be sensitive to the annealing conditions. The best films showed a narrow transition to superconductivity (5 K) and the completion of the transition above 83 K. X-ray analysis of the films showed a strong correlation of the midpoint of the transition with the dimensions of the unit cell.
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Habermeier et al. (1989) studied this question.
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