科研之友
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摘要
By measuring the temperature-dependent diamagnetic moments in the field cooling and zero-field-cooling processes on Bi2Sr2CaCu2O8, Bi2Sr2-xLaxCuO6 and overdoped La2-xSrxCuO4 single crystals, it is found that there are two distinct transitions on each M(T) curve at a high field (above about 1 kOe), but only one transition at a lower field. The unexpected second step on the M(T) curves at the irreversibility point cannot be understood within the picture of a second-order vortex-glass melting. For YBa2Cu3O7-delta Single crystals, this anomalous step was not observed up to a field of 5 T revealing a vortex glass transition behavior. Possible reasons are given to interpret this anomaly.
- 出版日期2000-7-1
- 单位中国科学院
