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Impact of dynamic orbital correlations on magnetic excitations in the normal state of iron-based superconductors

机译：动态轨道相关性对铁基超导体常态下磁激发的影响

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摘要

We show here that orbital degrees of freedom produce a distinct signature in the magnetic excitation spectrum of iron-based superconductors above the magnetic ordering temperature. Because d_(xz) and d_(yz) orbitals are strongly connected with Fermi surface topology, the nature of magnetic excitations can be modified significantly due to the presence of either static or fluctuating orbital correlations. Within a five-orbital itinerant model, we show that static orbital order generally leads to an enhancement of commensurate magnetic excitations even when the original Fermi surface lacks nesting at (π,0) or (0,π). When long-range orbital order is absent, Gaussian fluctuations beyond the standard random-phase approximation capture the effects of fluctuating orbital correlations on the magnetic excitations. We find that commensurate magnetic excitations can also be enhanced if the orbital correlations are strong. Our results offer a natural explanation for the incommensurate-to-commensurate transformation observed in a recent neutron scattering measurement (Xu et al., arXiv: 1201.4404), and we propose that this unusual transformation is an important signature to distinguish orbital from spin physics in the normal state of pnictides. Implications for the magnetic and superconducting states are discussed.
机译：我们在这里表明，轨道自由度在高于磁有序温度的铁基超导体的磁激发谱中产生独特的特征。由于d_（xz）和d_（yz）轨道与费米表面拓扑紧密相关，因此，由于存在静态或波动的轨道相关性，因此可以显着地修改磁激发的性质。在五轨道迭代模型中，我们表明，即使原始费米表面在（π，0）或（0，π）处没有嵌套，静态轨道顺序通常也会导致相应的磁激励增强。如果缺少远距离轨道阶数，则超出标准随机相位近似的高斯涨落将捕获波动轨道相关性对磁激励的影响。我们发现，如果轨道相关性很强，相应的磁激发也可以得到增强。我们的结果为最近的中子散射测量中观察到的不相称到相称转变提供了自然的解释（Xu等人，arXiv：1201.4404），并且我们建议这种不寻常的转变是区分轨道和自旋物理学的重要标志。杀菌剂的正常状态。讨论了磁和超导状态的含义。

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  • 来源
    《Physical review》 |2012年第9期|p.094516.1-094516.6|共6页
  • 作者

    Wei-Cheng Lee; Weicheng Lv; J. M. Tranquada; Philip W. Phillips;

  • 作者单位

    Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, USA;

    Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, USA;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, USA;

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  • 正文语种 eng
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  • 关键词

    theories and models of superconducting state; magnetic properties;

    机译：超导状态的理论和模型;磁性;

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