Abstract
The magnetic field distributions at the surface of field-oriented polycrystalline YBa2Cu3Ox disks were observed in a flux penetration process by a magneto optical method using magnetic films. The observed magnetic field has a minimum near the edge and was nearly constant in the inner region. It was found that such a distribution is characteristic of superconductors with weak links at the grain boundaries and that the inter-grain critical current is negligible in comparison with the intra-grain critical currents. We proved that the intra-grain critical current can be estimated from the difference between the applied field and the magnetic field in the inner region.
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