Nonlinear dynamics and dissipation of a curvilinear vortex driven by a strong time-dependent Meissner current
Nonlinear dynamics and dissipation of a curvilinear vortex driven by a strong time-dependent Meissner current
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由强时变迈斯纳电流驱动的曲线涡旋的非线性动力学和耗散
DOI：
10.1103/physrevb.101.064504
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发表时间：
2020
影响因子：
3.7
通讯作者：
Gurevich, A.
中科院分区：
文献类型：
--
作者：
Pathirana, W. P.;Gurevich, A.
我们报告了在平行于地表的强交流磁场下捕获涡旋线的大振幅振荡的数值模拟。考虑非线性涡线张力、涡质量和非线性拉金-奥夫钦尼科夫（LO）粘性阻力系数，计算了由表面交流迈斯纳电流驱动的振荡涡段耗散的功率。结果表明，随着涡流速度的减小，表面阻力的场依赖性将从根本上改变。在低频时，表面电阻表现出常规的增加，但随着增加，表面电阻变成一个非单调函数，随着高场强的增加而减小。计算了频率、引脚间距和平均自由通径对场依赖性的影响。结果表明，随着表面变脏和减小，异常下降的磁场向较低的磁场转移，而较低的磁场比临界磁场小得多。数值模拟还表明，在高场幅值和高场频率下，本征值的减小会导致涡旋弯曲不稳定，导致涡旋形成动态扭结。由垂直于表面的稀疏涡引起的测量可以提供机会研究在低温下由强电流密度驱动的涡的极端非线性动力学，直至相关极限。的行为可以通过改变射频频率或非磁性杂质的浓度来调节，而不会被直流或脉冲输运测量的强烈热效应所掩盖。
We report numerical simulations of large-amplitude oscillations of a trapped vortex line under a strong ac magnetic fieldparallel to the surface. The power dissipated by an oscillating vortex segment driven by the surface ac Meissner currents was calculated by taking into account the nonlinear vortex line tension, vortex mass, and a nonlinear Larkin-Ovchinnikov (LO) viscous drag coefficient. We show that the LO decrease ofwith the vortex velocitycan radically change the field dependence of the surface resistancecaused by trapped vortices. At low frequencies,exhibits a conventional increase with, but asincreases, the surface resistance becomes a nonmonotonic function ofwhichdecreaseswithat higher fields. The effects of frequency, pin spacing, and the mean-free pathon the field dependence ofwere calculated. It is shown that, as the surface gets dirtier anddecreases, the anomalous drop ofwithshifts to lower fields which can be much smaller than the lower critical magnetic field. Our numerical simulations also show that the LO decrease ofwithcan cause a vortex bending instability at high field amplitudes and frequencies, giving rise to the formation of dynamic kinks along the vortex. Measurements ofcaused by sparse vortices trapped perpendicular to the surface can offer opportunities to investigate an extreme nonlinear dynamics of vortices driven by strong current densities up to the depairing limit at low temperatures. The behavior of, which can be tuned by varying the rf frequency or concentration of nonmagnetic impurities, is not masked by strong heating effects characteristic of dc or pulse transport measurements.
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DOI：
10.1103/physrevstab.16.102002
发表时间：
2013
影响因子：
--
作者：
J.M.Vogt;O.Kugeler;J.Knobloch
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作者：
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DOI：
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发表时间：
2007
期刊：
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作者：
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DOI：
--
发表时间：
1998
期刊：
影响因子：
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作者：
E. Sonin;V. Geshkenbein;A. Otterlo;G. Blatter
通讯作者：
G. Blatter
DOI：
--
发表时间：
1983
期刊：
影响因子：
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作者：
G. Baym;E. Chandler
通讯作者：
E. Chandler