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Anisotropy of the dc conductivity due to orbital-selective spin fluctuations in the nematic phase of iron superconductors

机译:由于铁超导体的向轨道选择性旋转波动导致的直流电导率的各向异性

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摘要

We study the dc conductivity of iron-based superconductors within the orbital-selective spin fluctuation scenario. Within this approach, the anisotropy of spin fluctuations below the spin-nematic transition at T-S is also responsible for the orbital ordering, induced by nematic self-energy corrections to the quasiparticle dispersion. As a consequence, the anisotropy of the dc conductivity below T-S is determined not only by the anisotropy of the scattering rates as expected within a spin-nematic scenario, but also by the modification of the Fermi velocity due to the orbital reconstruction. More interestingly, it turns out that these two effects contribute to the dc-conductivity anisotropy with opposite signs. By using realistic band-structure parameters we compute the conductivity anisotropy for both 122 and FeSe compounds, discussing the possible origin of the different dc-conductivity anisotropy observed experimentally in these two families of iron-based superconductors.
机译:我们研究了轨道选择性旋转波动场景中的铁基超导体的直流电导。在该方法中,低于T-S下旋转向志转变的旋转波动的各向异性也负责轨道排序,通过向Quasiplicle分散的向量自能校正引起的轨道排序。因此,不仅通过在旋转向列法内预期的散射速率的各向异性而不是在旋转向内情景中的各向异性而不是在旋转重建而导致的散射速度的各向异性确定的直流电导率的各向异性。事实证明,这两种效应有助于具有相反迹象的直流导电性各向异性。通过使用现实的带状结构参数,我们计算122和FESE化合物的电导率各向异性,讨论在这两个铁基超导体家族中实验观察到不同的直流导电性各向异性的可能起源。

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  • 来源
    《Physical review》 |2019年第15期|155117.1-155117.14|共14页
  • 作者单位

    CSIC ICMM Mat Sci Factory E-28049 Madrid Spain;

    CNR IOM Via Bonomea 265 I-34136 Trieste Italy|Int Sch Adv Studies SISSA Via Bonomea 265 I-34136 Trieste Italy;

    Sapienza Univ Rome ISC CNR Ple A Moro 5 I-00185 Rome Italy|Sapienza Univ Rome Dept Phys Ple A Moro 5 I-00185 Rome Italy;

    CSIC ICMM Mat Sci Factory E-28049 Madrid Spain;

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