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arXiv 1406.5693cond-mat.supr-con
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单带和三带超导体约瑟夫森点接触中的阻挫现象

Frustration phenomena in Josephson point contacts between single-band and three-band superconductors

Y. S. Yerin, A. N. Omelyanchouk

摘要:

在Usadel方程的形式下,研究了单带和三带超导体脏点接触中的约瑟夫森效应。得到了适用于任意温度的约瑟夫森电流的一般表达式。我们计算了很低温度和临界温度附近的电流-相位关系。对于时间反转对称性破缺的三带超导体,点接触经历不同电流-相位关系的阻挫现象,对应于双接触。对于没有BTRS的三带超导体,我们有接近正弦的电流-相位关系和挫折的情况下,除了在很低的温度下,在一定条件下,实现两个基态的点接触。我们的结果可以作为探测三带超导系统中可能存在的BTRS态的潜在探针。

英文摘要:

Within the formalism of Usadel equations the Josephson effect in dirty point contacts between single-band and three-band superconductors is investigated. The general expression for the Josephson current, which is valid for arbitrary temperatures, is obtained. We calculate current-phase relations for very low temperature and in the vicinity of the critical temperature. For three-band superconductors with broken time-reversal symmetry (BTRS) point contacts undergo frustration phenomena with different current-phase relations, corresponding to ϕ-contacts. For three-band superconductors without BTRS we have close to sinusoidal current-phase relations and absence of the frustration, excepting the case of very low temperature, where under certain conditions two ground states of the point contact are realized. Our results can be used as the potential probe for the detection of the possible BTRS state in three-band superconducting systems.

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