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arXiv 0906.4256cond-mat.supr-concond-mat.mes-hall
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非平衡超导体/正常金属隧道结构中的非均匀态:非磁系统的类LOFF相

Inhomogeneous state in non-equilibrium superconductor/normal metal tunnel structures: a LOFF-like phase for non-magnetic systems

A. Moor, A. F. Volkov, K. B. Efetov

摘要:

本文分析了隧道电流$I$作用下隧道超导体-正常金属(NSN)结构中的非平衡态。我们使用一个近似的有效温度$T$和计算的电流-电压I-V特性。结果表明,I-V关系可以有一个S形的形式。我们确定不均匀的电流$I(x)$和温度$T(x)$的分布,所产生的结果的不稳定性的均匀状态与负微分电导($dI/dV<0$)。我们讨论了一个类比与平衡超导体的交换场,其中不均匀状态预测的拉金Ovchinnikov和富尔德费雷尔是可能的。

英文摘要:

We analyze non-equilibrium states in a tunnel superconductor-normal metal (NSN) structure in the presence of a tunnel current $I$. We use an approximation of an effective temperature $T$ and calculate the current-voltage I-V characteristics. It is shown that the I-V dependence may have an S-shaped form. We determine nonuniform current $I(x)$ and temperature $T(x)$ distributions that arise as a result of instability of the uniform state with negative differential conductance ($dI/dV<0$). We discuss an analogy with equilibrium superconductors with an exchange field in which nonuniform states predicted by Larkin-Ovchinnikov and Fulde-Ferrel are possible.

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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