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Quasiparticle interference in iron-based superconductors

机译:铁基超导体中的准粒子干扰

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摘要

We systematically calculate quasiparticle interference (QPI) signatures for the whole phase diagram of iron-based superconductors. Impurities inherent in the sample together with ordered phases lead to distinct features in the QPI images that are believed to be measured in spectroscopic imaging-scanning tunneling microscopy. In the spin-density wave phase the rotational symmetry of the electronic structure is broken, signatures of which are also seen in the coexistence regime with both superconducting and magnetic order. In the superconducting regime we show how the different scattering behavior for magnetic and nonmagnetic impurities allows to verify the s~(+-) symmetry of the order parameter. The effect of possible gap minima or nodes is discussed.
机译:我们系统地计算了铁基超导体整个相图的准粒子干扰(QPI)信号。样品中固有的杂质以及有序的相导致QPI图像中的明显特征,这些特征被认为是在光谱成像-扫描隧道显微镜中测量的。在自旋密度波阶段,电子结构的旋转对称性被破坏,在超导和磁序共存的状态下也可以看到其签名。在超导状态下,我们显示了磁性和非磁性杂质的不同散射行为如何允许验证阶数参数的s〜(+-)对称性。讨论了可能的间隙最小值或节点的影响。

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  • 来源
    《Physical review》 |2010年第22期|p.379-386|共8页
  • 作者单位

    Institut fuer Theoretische Physik Ⅲ, Ruhr-Universitaet Bochum, D-44801 Bochum, Germany;

    Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany;

    Institut fuer Theoretische Physik Ⅲ, Ruhr-Universitaet Bochum, D-44801 Bochum, Germany;

    Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    band and itinerant models; spin-density waves;

    机译:带和流动模型;自旋密度波;

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