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arXiv 1003.4606cond-mat.supr-concond-mat.mes-hall
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横向磁通Transformer效应中的非局域与局域涡旋动力学

Nonlocal vs local vortex dynamics in the transversal flux transformer effect

Florian Otto, Ante Bilusic, Dinko Babic, Denis Yu. Vodolazov, Christoph Suergers, Christoph Strunk

摘要:

在我们最近的信[F]的后续行动中。奥托等人,物理修订版信函104,027005(2010)]中,我们提出了在局部涡旋运动中的强非平衡状态下的非晶(α-)NbGe纳米结构中的超导横向磁通Transformer效应(TFTE)的更详细的说明。重点放在TFTE和当地涡动力学之间的关系,因为前者原来是一个可靠的工具,用于确定后者背后的微观机制。通过这种方法,在0.26 < T/Tc < 0.95的范围内跟踪了从低温T下的电子加热到接近转变温度Tc的拉金-奥夫钦尼科夫效应的过程。这是由一些相关的参数,如涡输运熵相关的能斯特效应在低T,和非平衡磁化强度增强接近Tc。在中间T,拉金-奥夫钦尼科夫效应是在高电流修改的电子加热,这是清楚地观察到只有在TFT。

英文摘要:

In this follow-up to our recent Letter [F. Otto et al., Phys. Rev. Lett. 104, 027005 (2010)], we present a more detailed account of the superconducting transversal flux transformer effect (TFTE) in amorphous (a-)NbGe nanostructures in the regime of strong nonequilibrium in local vortex motion. Emphasis is put on the relation between the TFTE and local vortex dynamics, as the former turns out to be a reliable tool for determining the microscopic mechanisms behind the latter. By this method, a progression from electron heating at low temperatures T to the Larkin-Ovchinnikov effect close to the transition temperature Tc is traced over a range 0.26 < T/Tc < 0.95. This is represented by a number of relevant parameters such as the vortex transport entropy related to the Nernst-like effect at low T, and a nonequilibrium magnetization enhancement close to Tc. At intermediate T, the Larkin-Ovchinnikov effect is at high currents modified by electron heating, which is clearly observed only in the TFTE.

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