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Flux Density Distribution in YBa2Cu3Ox Specimens with Fine Y2BaCuO5 Dispersions

The flux density distribution in YBa2Cu3Ox bulk superconductor with fine Y2BaCuO5 dispersion is observed from the change of domain patterns in iron garnet films. The flux density increases not only at the edge of the sample, but also at the inner part with increasing magnetic field. The region with large critical current was of a comparable size to the grain. It was concluded that the low critical current estimated from the transport method is due to the weak link of the grain boundary.