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E-J Characteristics and Distribution of Local Jc for Melt-Textured Grown Bulk YBa2Cu3O7 under High Magnetic Fields

In order to evaluate the distribution of flux pinning for a melt-textured grown bulk YBa2Cu3O7 under magnetic fields, the E-J properties for samples prepared under various magnetic fields were measured. The measured E-J properties were analyzed on the basis of a local Jc distribution model proposed by Yamafuji and Kiss [K. Yamafuji and T. Kiss: Physica C 290 (1997) 9]. The distribution of local Jc was found to narrow continuously with increasing magnetic field applied to the melt growth process, independent of the critical current density. The weak links at subdomain boundaries were considered to improve as a result of the change in crystallinity.