Magnetization measurements were performed at 77 K on Bi-Sr-Ca-Cu-O compounds having zero resistance temperatures at 103 and 82 K. The lower critical field Hc1 of the 103 K material was found to be 60% less than the Hc1 of YBa2Cu3O7. This suggests that the material has a higher Hc2 . The new compound also has less magnetization hysteresis than the YBa2Cu3O7 compound.
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Kumakura et al. (1988) studied this question.
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