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arXiv 1410.4606cond-mat.supr-con
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直流和交流磁场下薄膜屏中约瑟夫森涡旋的非线性动力学

Nonlinear dynamics of Josephson vortices in a film screen under dc and ac magnetic fields

Ahmad Sheikhzada, Alexander Gurevich

摘要:

我们提出了详细的数值模拟的约瑟夫森结垂直于薄膜屏幕在强直流和交流磁场下的约瑟夫森涡旋。通过求解sine-Gordon方程,计算了磁通子穿透的阈值磁场随频率的变化,以及振荡磁通子所消耗的功率随交流场幅值和频率的变化。我们考虑了叠加的交流和直流场的影响,以及双谐波磁场导致的涡旋棘轮动力学。结果被用来评估的贡献弱连接晶界的多晶超导体在强电磁场下的非线性表面电阻,特别是薄膜屏幕和谐振腔。

英文摘要:

We present detailed numerical simulations of Josephson vortices in a long Josephson junction perpendicular to a thin film screen under strong dc and ac magnetic fields. By solving the sine-Gordon equation, we calculated the threshold magnetic field for penetration of fluxons as a function of frequency, and the power dissipated by oscillating fluxons as functions of the ac field amplitude and frequency. We considered the effects of superimposed ac and dc fields, and a bi-harmonic magnetic field resulting in a vortex ratchet dynamics. The results were used to evaluate the contribution of weak-linked grain boundaries to the nonlinear surface resistance of polycrystalline superconductors under strong electromagnetic fields, particularly thin film screens and resonator cavities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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