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arXiv 1201.2453cond-mat.supr-con
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铁基超导体中子散射的Q扫描分析

Q-scan-analysis of the neutron scattering in iron-based superconductors

Yuki Nagai, Kazuhiko Kuroki

摘要:

我们提出了一种利用中子散射数据的动量(Q)扫描来确定铁磷属元素化物超导体的配对状态的方法。利用有效五轨道模型并考虑准粒子阻尼,研究了不同掺杂水平下s+-和s++超导态的自旋磁化率.随着掺杂水平从电子掺杂降低到空穴掺杂,强度的峰值位置从线Qx = pi上的位置移动到线Qy = 0上的位置。我们发现,在s ~+-波对和s ~++ -波对之间,超导态与正常态的强度比对Q的依赖性是不同的。我们建议在实验中研究这个比例在Q空间区分两个配对状态。

英文摘要:

We propose a way to determine the pairing state of the iron pnictide superconductors exploiting the momentum (Q) scan of the neutron scattering data. We investigate the spin susceptibility in the s+- and s++ superconducting states for various doping levels using the effective five-orbital model and considering the quasiparticle damping. The peak position of the intensity shifts from the position on the line Qx = pi to that on the line Qy = 0 as the doping level is decreased from electron doping to hole doping. We find that the Q-dependence of the ratio of the intensity in the superconducting state to that in the normal state is qualitatively different between the s+- -wave and s++ -wave pairings. We propose to investigate experimentally this ratio in Q-space to distinguish the two pairing states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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