Abstract

In order to investigate the relationship between the oxygen deficiency and the weak links in sintered YBa2Cu3Oy, the inter- and intra-grain critical current densities (JcT and JcM) were measured for the samples with different oxygen contents. It is found that the JcT-B characteristics become worse with decreasing oxygen contents, while, the JcM-B characteristics, which are larger over four orders than the JcT'S, are almost unchanged. These results suggest that the oxygen deficiency exists at the grain boundaries and that is the origin of weak links in sintered YBa2Cu3Oy.

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