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arXiv 1209.0709cond-mat.supr-con
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Fe基超导体中Zn杂质效应及$s_{\pm}$ -和$s_{++}$ -对的相互作用

Zn-impurity effect and interplay of $s_{\pm}$- and $s_{++}$-pairings in Fe-based superconductors

Zi-Jian Yao, Wei-Qiang Chen, Yu-ke Li, Guang-han Cao, Hong-Min Jiang, Qian-En Wang, Zhu-an Xu, Fu-Chun Zhang

摘要:

本文对铁基超导体中Zn杂质的影响进行了理论和实验研究。预期Zn杂质会严重抑制符号反转的s $_\pm$波配对。实验观察到的抑制T $_c$下Zn掺杂强烈依赖于材料和载流子含量,这表明在铁基超导体中的$s_{++}$和$s_{\pm}$配对的竞争。利用Bogoliubov de-Gennes方程研究了一个同时包含$s_{++}$和$s_{\pm}$配对耦合的模型,发现Zn杂质强烈抑制了$s_{\pm}$配对,并可能诱导从$s_{\pm}$到$s_{++}$波的跃迁.我们的理论与杂质效应的各种实验是一致的。我们提出了新的实验数据的Zn掺杂SmFe $_{1-x}$ Zn $_x$ AsO $_{0.9}$ F $_{0.1}$的T $_c=$ 50 K,进一步支持我们的建议。

英文摘要:

We report theoretical and experimental studies of the effect of Zn-impurity in Fe-based superconductors. Zn-impurity is expected to severely suppress sign reversed s$_\pm$ wave pairing. The experimentally observed suppression of T$_c$ under Zn-doping strongly depends on the materials and the charge carrier contents, which suggests competition of $s_{++}$ and $s_{\pm}$ pairings in Fe-base superconductors. We study a model incorporating both $s_{++}$ and $s_{\pm}$ pairing couplings by using Bogoliubov de-Gennes equation, and show that the Zn-impurity strongly suppresses $s_{\pm}$ pairing and may induce a transition from $s_{\pm}$ to $s_{++}$-wave. Our theory is consistent with various experiments on the impurity effect. We present new experimental data on the Zn-doping SmFe$_{1-x}$Zn$_x$AsO$_{0.9}$F$_{0.1}$ of T$_c=$ 50K, in further support of our proposal.

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