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arXiv 1610.04166cond-mat.supr-con
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两带超导相干性的异常边界效应

Unusual boundary effect on coherency of two-band superconductivity

Artjom Vargunin, Küllike Rägo, Teet Örd

摘要:

我们表明,愈合的两个带超导系统的表面附近是由长度尺度是完全不同的相关长度。与单带情况类似,其中一个特征长度在临界温度$T_c$处发散,而另一个特征长度在$T_{c+}<T_c$处表现出奇异性。通过远离边界,这些尺度接近体态的相干长度,其中$T_{c+}$处的发散被任意弱带间耦合消除。这种边界驱动的相干性修改影响邻近现象。研究表明,随着双带超导层的变薄,二元NS系统的临界温度在$T_{c+}$附近出现拐点。

英文摘要:

We demonstrate that the healing of two-band superconductivity near the surface of the system is governed by length scales which are drastically different from correlation lengths. Similar to the one-band case, one of the characteristic lengths diverges at critical temperature $T_c$, while another one shows unusual behaviour having singularity at $T_{c+}<T_c$. By moving away from the boundary, these scales approach coherence lengths in the bulk state, where the divergence at $T_{c+}$ is removed by arbitrary weak interband coupling. Such a boundary-driven modification in coherency affects proximity phenomenon. We show that critical temperature of binary NS system can exhibit an inflection near $T_{c+}$ as two-band superconducting layer becomes thinner.

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