10T Class Trapped Field Properties of a Large Gd-Ba-Cu-O Bulk Superconductor

So far there have been few reports on high trapped fields for a large superconducting bulk because of large electromagnetic force and insufficient homogeneity. In this paper, the temperature dependence of trapped field for one large crystal of Gd-Ba-Cu-O 46 mm in diameter was empirically investigated. The sample was not broken even in the 10 T field-cooling, implying that the sample quality is excellent in spite of the large size. The trapped field measured at the sample surface was 9.1 T at 42 K, but it can be estimated approximately 13 T by extrapolating the experimental data over 60 K.