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摘要
Recent experiments on pulsed-zero field cool magnetization of bulk high J(c) YBCO (YBa2Cu3O7-delta) have shown unexpected results. For example, reproducible, non-destructive, rapid, giant field leaps (GFLs) to higher penetrated field are observed. The observations are inconsistent with the critical state model (CSM), in several aspects. Additional experiments have been pursued in an attempt to clarify the physics involved in the observed anomalies. Here, we present experimental results for the J(c) dependence of the anomalous features. It is found that the sudden field increase in the GFL is a monotonically increasing function of J(c). The ratio of required pulsed field amplitude, B-A,B-max, to obtain maximum trappable field, B-T,B-max, which CSM predicts to be >= 2.0, gradually approaches 1.
- 出版日期2016-4-7
