The ac magnetic susceptibility of the Bi-(Pb)-Sr-Ca-Cu-O system in which the high-T c phase (T c>100 K) is the chief constituent has been measured. The diamagnetism attributed to the Josephson-like weak coupling is sensitive to the synthetic conditions and the grain contact structure. The magnetic susceptibility of BiSrCa3Cu4O x sintered for different periods has revealed that the Josephson-like coupling property is degraded as the volume fractions of the low-T c phase (T c∼75 K) and the insulating phases are decreased and the high-T c phase is formed.
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Sumiyama et al. (1989) studied this question.
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