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Thick films of superconductive BiSrCaCu 2 O x were prepared by rapid quenching without any substrate. The as-quenched film was amorphous-like and not superconductive, but after heat treatment at 850–880°C, it showed superconductivity with a zero-resistance temperature of 60 K and a critical current of 220 A/cm 2 at 4.2 K.
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Shimomura et al. (1988) studied this question.
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