Vortex-antivortex dynamics in mesoscopic symmetric and asymmetric superconducting loops with an applied ac current

Vortex-antivortex dynamics in mesoscopic symmetric and asymmetric superconducting loops with an applied ac current
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施加交流电流的介观对称和非对称超导环路中的涡反涡动力学

DOI:
10.1209/0295-5075/108/57001
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发表时间:
2014-12
期刊:
EPL
影响因子:
1.8
通讯作者:
Shi-Ping Zhou
Shi-Ping Zhou
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Guo-Qiao Zha;F. M. Peeters;Shi-Ping Zhou

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在时间相关的Ginzburg-Landau形式主义的框架中,我们研究了施加交流电流下介观对称和非对称超导环路中涡旋-反涡旋(V-Av)对的动力学。与恒定偏置直流电流的情况相反,V-Av 碰撞和湮灭的过程受到时间周期交流信号的强烈影响。当施加的交流电流的方向反转时,现有的 V-Av 对向后移动,然后与对称环路中新创建的 Av-V 对发生碰撞。在存在适当的外部磁场的情况下,观察到磁化曲线的新型正弦振荡模式,并且样品的两个分支中都发生 V-Av 湮灭的周期性动态过程。此外,对于具有偏心孔的不对称样品,V-Av对的产生点偏离样品的中心,并且V-Av对的产生和湮灭动力学与对称情况有很大不同。
In the framework of the time-dependent Ginzburg-Landau formalism, we study the dynamics of vortex-antivortex (V-Av) pairs in mesoscopic symmetric and asymmetric superconducting loops under an applied ac current. In contrast to the case of a constant biasing dc current, the process of the V-Av collision and annihilation is strongly affected by the time-periodic ac signal. As the direction of the applied ac current is reversed, the existed V-Av pair moves backward and then collides with a new created Av-V pair in a symmetric loop. In the presence of an appropriate external magnetic field, a novel sinusoidal-like oscillatory mode of the magnetization curve is observed, and the periodic dynamical process of the V-Av annihilation occurs in both branches of the sample. Moreover, for the asymmetric sample with an off-centered hole the creation point of the V-Av pair shifts away from the center of the sample, and the creation and annihilation dynamics of V-Av pairs turns out to be very different from the symmetric case.
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