We have measured magnetization of sintered YBa 2 Cu 3 O 7- x plates in a parallel magnetic field at 77 K. It was found that the difference Δ M in the magnetization between increasing and decreasing processes of the external field depends little upon the thickness of the plate, and it is predicted by the `critical-state' model that the difference is proportional to the thickness in a uniform specimen. The present experimental results suggest that the sintered plates consist of small superconducting sub-structures and that the superconducting connections among these sub-structures are not strong.
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Funaki et al. (1987) studied this question.
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