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The critical current of ceramic YBa 2 Cu 3 O 7- x samples with a variety of cross-sectional areas were measured at 77 K and the critical magnetic field at the surface of the samples was estimated to be about 10 Oe. The remarkable diamagnetic response corresponding to the weak field breakdown of superconductivity was observed for the first time.
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Yamada et al. (1989) studied this question.
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