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arXiv 0903.3262cond-mat.supr-con
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晶界中单涡的动力学:飞秒伏特尺度上的I-V特性

Dynamics of single vortices in grain boundaries: I-V characteristics on the femto-volt scale

B. Kalisky, J. R. Kirtley, E. A. Nowadnick, R. B. Dinner, E. Zeldov, Ariando, S. Wenderich, H. Hilgenkamp, D. M. Feldmann, K. A. Moler

摘要:

我们采用了扫描霍尔探针显微镜来检测在施加电流的存在下,沿晶界在YBCO薄膜的钉扎位置之间的单个涡旋的跳跃。检测单个涡旋的运动使我们能够探测晶界的电流-电压(I-V)特性,电压灵敏度低于飞秒伏。我们发现,V~I^n的耗散具有前所未有的高指数n~290,基本上不依赖于温度或晶界角。我们的数据在现有的晶界输运模型中没有直接的解释。

英文摘要:

We employed a scanning Hall probe microscope to detect the hopping of individual vortices between pinning sites along grain boundaries in YBCO thin films in the presence of an applied current. Detecting the motion of individual vortices allowed us to probe the current-voltage (I-V) characteristics of the grain boundary with voltage sensitivity below a femto-volt. We find a very sharp onset of dissipation with V~I^n with an unprecedented high exponent of n~290 that shows essentially no dependence on temperature or grain boundary angle. Our data have no straightforward explanation within the existing grain boundary transport models.

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