Dynamical aspects of strong pinning of magnetic vortices in type-II superconductors.
Dynamical aspects of strong pinning of magnetic vortices in type-II superconductors.
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II 型超导体中磁涡流强钉扎的动力学方面。
DOI：
10.1103/physrevlett.108.217001
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发表时间：
2012
影响因子：
8.6
通讯作者：
G. Blatter
中科院分区：
文献类型：
--
作者：
A. U. Thomann;V. Geshkenbein;G. Blatter
我们确定的电流-电压特性的II型超导体中存在的强钉扎中心。聚焦于小密度的缺陷，我们推导出一个通用形式的特性与线性磁通流分支转移的临界电流（过流特性）。开始附近的细节，滞后跳跃（对于κ>>1）或平滑的速度开启（κ→1），取决于表征钉扎中心的Labusch参数κ。将单钉扎分析推到弱钉扎域，我们再现了临界电流的集体钉扎结果。
We determine the current-voltage characteristic of type-II superconductors in the presence of strong pinning centers. Focusing on a small density of defects, we derive a generic form for the characteristic with a linear flux-flow branch shifted by the critical current (excess-current characteristic). The details near onset, a hysteretic jump (for κ>>1) or a smooth velocity turn-on (κ→1), depend on the Labusch parameter κ characterizing the pinning centers. Pushing the single-pin analysis into the weak pinning domain, we reproduce the collective pinning results for the critical current.