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arXiv 0712.3446cond-mat.supr-con
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YBCO薄膜中向正常态转变时的涡旋动力学

Vortex Dynamics at the transition to the normal state in YBCO films

P. Bernstein, J. F. Hamet, M. T. Gonzalez, M. Ruibal Acuna

摘要:

我们提出了一个描述的涡旋动力学在YBCO薄膜从临界到正常状态。这种描述假设的涡旋运动是热激活沿孪晶界的薄膜。在过渡到正常状态的电流-电压曲线中观察到的不连续性被解释为由于涡旋脱钉导致的耗散功率率的突然增加。而在临界温度附近,由于涡激活能接近于零,这种现象不会发生。我们还展示了如何在过渡到正常状态的电流可以计算出在低电流下测得的电流-电压曲线。将该描述的预测与Gonzalez等人[Phys.Rev.B68,054514(2003)]发表的数据进行比较。

英文摘要:

We propose a description of the vortex dynamics in YBCO films from the critical to the normal states. This description supposes that the vortex motion is thermally activated along the twin boundaries of the films. The discontinuity observed in the current-voltage curves at the transition to the normal state is explained by the sudden increase in the dissipated power rate due to vortex depinning. However, near the critical temperature, this phenomenon does not occur because the vortex activation energy is near zero. We also show how the current at the transition to the normal state can be computed from the current-voltage curves measured at low currents. The predictions of this description are compared to the data published by Gonzalez et al. [Phys.Rev.B68,054514 (2003)].

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