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arXiv 1002.0363cond-mat.supr-concond-mat.mes-hall
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$s_\pm$超导体中亚能隙态的统计

Statistics of subgap states in $s_\pm$ superconductors

A. Glatz, A. E. Koshelev

摘要:

在新的铁基超导体中,有一种不寻常的$s_{\pm}$超导态得到了强有力的支持,在这种超导态中,带隙参数在不同的能带中具有相反的符号。在这种情况下,杂质在不同能带之间的散射具有对断裂效应,并在带隙内引入态。研究了$s_{\pm}$超导体中杂质集体效应引起的无序诱导亚带隙态的统计特性。通过数值求解两带Bogolyubov方程,研究了态密度和局域化长度的变化规律。我们定位的流动性边缘分离的本地化和离域状态的3D的情况下,弱和强本地化制度的2D的情况下之间的交叉。我们发现,广泛使用的自洽T矩阵近似在描述亚能隙态时并不十分准确。

英文摘要:

There is strong support in favor of an unusual $s_{\pm}$ superconducting state in the new iron-based superconductors, in which the gap parameter has opposite signs in different bands. In this case scattering between different bands by impurities has a pair-breaking effect and introduces states inside the gap. We studied the statistics of disorder-induced subgap states in $s_{\pm}$ superconductors due to collective effects of impurities. Numerically solving the two-band Bogolyubov equations, we explored the behavior of the density of states and localization length. We located the mobility edge separating the localized and delocalized states for the 3D case and the crossover between the weak and strong localization regimes for the 2D case. We found that the widely used self-consistent T-matrix approximation is not very accurate in describing subgap states.

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