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Guiding of vortices and ratchet effect in superconducting films with asymmetric pinning potential

机译:具有不对称钉扎势的超导薄膜的涡旋引导和棘轮效应

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摘要

Two-dimensional vortex dynamics in a ratchet washboard planar pinning potential in the presence of thermal fluctuations is considered on the basis of a Fokker-Planck equation. Explicit expressions for two nonlinear anisotropic voltages (longitudinal and transverse with respect to the current direction) are derived and analyzed. The physical origin of these odd (with respect to magnetic field or transport current direction reversal) voltages is caused by the interplay between the even effect of vortex guiding and the ratchet asymmetry. Both voltages are going to zero in the linear regimes of the vortex motion [i.e., in the thermally activated flux flow (TAFF) and Ohmic flux flow (FF) regimes] and have a bumplike current or temperature dependence in the vicinity of the highly nonlinear resistive transition from the TAFF to the FF.
机译:基于Fokker-Planck方程,考虑了存在热波动的棘轮搓板平面钉扎电势中的二维涡旋动力学。推导并分析了两个非线性各向异性电压(相对于电流方向的纵向和横向)的明确表达式。这些奇数(相对于磁场或传输电流方向反转)电压的物理起源是由涡旋引导的偶数效应和棘轮不对称性之间的相互作用引起的。在涡旋运动的线性状态下(即在热激活磁通量流(TAFF)和欧姆流通量(FF)情况下),这两个电压都将为零,并且在高度非线性附近具有颠簸状电流或温度依赖性从TAFF到FF的电阻性过渡。

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