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arXiv 1606.06100cond-mat.supr-concond-mat.stat-mech
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无序II型超导体中电流猝灭后的磁通线弛豫动力学

Flux line relaxation kinetics following current quenches in disordered type-II superconductors

Harshwardhan Chaturvedi, Hiba Assi, Ulrich Dobramysl, Michel Pleimling, Uwe C. Täuber

摘要:

利用Langevin分子动力学模拟的弹性线模型,研究了第二类超导体中磁涡旋线随外加驱动电流快速变化的弛豫动力学.在具有随机分布的点状缺陷的样品中的磁通涡旋系统经受适当强度的外部电流足够长的时间,以便处于移动的非平衡稳态。然后,电流瞬间降低到与移动或固定状态有关的值。随后松弛的磁通线研究通过一次观测,如他们的平均速度和回转半径。此外,我们还测量了两次磁通线高度自相关函数,以研究系统中的动态标度和老化行为,特别是淬火后出现的玻璃钉扎状态。

英文摘要:

We investigate the relaxation dynamics of magnetic vortex lines in type-II superconductors following rapid changes of the external driving current by means of an elastic line model simulated with Langevin molecular dynamics. A system of flux vortices in a sample with randomly distributed point-like defects is subjected to an external current of appropriate strength for a sufficient period of time so as to be in a moving non-equilibrium steady state. The current is then instantaneously lowered to a value that pertains to either the moving or pinned regime. The ensuing relaxation of the flux lines is studied via one-time observables such as their mean velocity and radius of gyration. We have in addition measured the two-time flux line height autocorrelation function to investigate dynamical scaling and aging behavior in the system, which in particular emerge after quenches into the glassy pinned state.

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