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arXiv 1609.02533cond-mat.supr-con
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由Josephson 0或pi结封闭的超导薄环的邻近诱导最小半径

Proximity-induced minimum radius of superconducting thin rings closed by the Josephson 0 or pi junction

Yu. S. Barash

摘要:

超导性被证明是完全破坏薄介观或纳米级环封闭的结与一个明显的界面对断裂和/或约瑟夫森耦合,如果一个环的半径r是小于最小半径r_min。数量r_min取决于跨结的相位差,或控制的相位差的磁通偏置环上的磁通量。它还取决于约瑟夫森和界面有效耦合常数,特别是取决于环是由0结还是π结闭合。当环的半径对于一些相位差值超过r_min或稍微超过其最大值时,电流-相位关系被实质上修改。修正后的临界温度Tc以及Tc附近随温度变化的超导电流都是环半径和磁通量的函数。

英文摘要:

Superconductivity is shown to be completely destroyed in thin mesoscopic or nanoscopic rings closed by the junction with a noticeable interfacial pair breaking and/or a Josephson coupling, if a ring's radius r is less than the minimum radius r_min. The quantity r_min depends on the phase difference across the junction, or on the magnetic flux that controls the phase difference in the flux-biased ring. It also depends on the Josephson and interfacial effective coupling constants, and in particular, on whether the ring is closed by 0 or pi junction. The current-phase relation is substantially modified when the ring's radius exceeds r_min for some of the phase difference values, or slightly goes beyond its maximum. The modified critical temperature Tc, as well as the temperature dependent supercurrent near Tc are identified here as functions of the ring's radius and the magnetic flux.

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