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arXiv 0708.3841cond-mat.supr-concond-mat.dis-nn
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非常规超导体中的介观能隙涨落

Mesoscopic gap fluctuations in an unconventional superconductor

Victor Galitski

摘要:

我们研究了各向异性带隙超导体中的介观无序涨落,它导致了局域配对温度的空间变化和在平均场转变之上超导岛的形成。我们导出了对温度和超导能隙的概率分布函数。结果表明,以上的平均场转变,一个无序的BCS超导体与一个不寻常的配对对称性所描述的超导岛和金属区域的网络具有强烈的抑制态密度,由于超导波动。我们认为,与介观无序波动的现象也可能是相关的高温超导体,特别是最近的STM实验中,间隙不均匀性已明确观察到。有人建议,在赝隙相的间隙波动应直接关系到相应的配对温度的波动。

英文摘要:

We study mesoscopic disorder fluctuations in an anisotropic gap superconductor, which lead to the spatial variations of the local pairing temperature and formation of superconducting islands above the mean-field transition. We derive the probability distribution function of the pairing temperatures and superconducting gaps. It is shown that above the mean-field transition, a disordered BCS superconductor with an unusual pairing symmetry is described by a network of superconducting islands and metallic regions with a strongly suppressed density of states due to superconducting fluctuations. We argue that the phenomena associated with mesoscopic disorder fluctuations may also be relevant to the high-temperature superconductors, in particular, to recent STM experiments, where gap inhomogeneities have been explicitly observed. It is suggested that the gap fluctuations in the pseudogap phase should be directly related to the corresponding fluctuations of the pairing temperature.

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