Abstract
The anomalies in the ac response of the melt textured Y-123 superconductors to the electromagnetic excitation are observed, studied, and interpreted. Significant deviations in the behavior of the dynamic magnetic susceptibility from the predictions of the critical state model are detected. In particular, good melt textured samples demonstrate a significant deviation from the ideal diamagnetism even at negligible amplitudes of the ac field. The anomalies are pronounced if the exciting ac magnetic-field h is oriented perpendicularly to the crystallographic axis c. The observed results are attributed to peculiarities of the defect structure that is characteristic of the melt textured superconductors.
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