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arXiv 1003.0387cond-mat.supr-con
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周期性收缩超导通道中的涡旋动力学

Vortex dynamics in superconducting channels with periodic constrictions

K. Yu, M. B. S. Hesselberth, P. H. Kes, B. L. T. Plourde

摘要:

被限制在具有周期性收缩的超导易流动通道中的涡旋在临界电流中表现出可逆振荡,在临界电流处,涡旋随着外部磁场的变化而开始移动。尽管屏蔽效应起着重要作用,但这种可扩散性与通道形状和布置成比例。对于大的磁场,一些涡旋变得钉扎在通道外部,导致临界电流中的磁滞。一些通道配置也表现出在匹配场附近的磁通流制度的动态滞后。

英文摘要:

Vortices confined to superconducting easy flow channels with periodic constrictions exhibit reversible oscillations in the critical current at which vortices begin moving as the external magnetic field is varied. This commensurability scales with the channel shape and arrangement, although screening effects play an important role. For large magnetic fields, some of the vortices become pinned outside of the channels, leading to magnetic hysteresis in the critical current. Some channel configurations also exhibit a dynamical hysteresis in the flux-flow regime near the matching fields.

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