arXiv 0907.28262009-07-16cond-mat.supr-con

磷属元素化物中超导性和自旋密度波的共存：能隙对称性和节线

Coexistence of superconductivity and a spin density wave in pnictides: Gap symmetry and nodal lines

D. Parker, M. G. Vavilov, A. V. Chubukov, I. I. Mazin

DOI：: 10.1103/PhysRevB.80.100508

摘要：

研究了自旋密度波对铁基超导体中$s_{\pm}$超导电性的影响。我们发现，与通常的看法相反，当空穴和电子口袋在SDW状态下折叠时，在新的重新连接的费米表面上没有节点打开，尽管$s_{\pm}$间隙在两个口袋之间改变了符号。相反，序参量沿着新形成的费米面保持其符号。$s_{\pm}$对称性的熟悉的实验特征仍然被保留，尽管它们在数学上以不同的方式出现。对于常规$s$情况（$s_{++})$），节点确实出现在SDW状态中。这种区别表明了一种新的简单的方法来实验分离的$s_{\pm}$状态从一个定期$s$在pnictides。我们认为，最近发表的共存状态下的热导率数据是一致的$s_{\pm},$，但不是$s_{++}$状态。

英文摘要：

We investigate the effect of a spin-density wave (SDW) on $s_{\pm}$ superconductivity in Fe-based superconductors. We show that, contrary to the common wisdom, no nodes open at the new, reconnected Fermi surfaces when the hole and electron pockets fold down in the SDW state, despite the fact that the $s_{\pm}$ gap changes sign between the two pockets. Instead, the order parameter preserves its sign along the newly formed Fermi surfaces. The familiar experimental signatures of an $s_{\pm}$ symmetry are still preserved, although they appear in a mathematically different way. For a regular $s$ case ($s_{++})$ the nodes do appear in the SDW state. This distinction suggests a novel simple way to experimentally separate an $s_{\pm}$ state from a regular $s$ in the pnictides. We argue that recently published thermal conductivity data in the coexisting state are consistent with the $s_{\pm},$ but not the $s_{++}$ state.

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