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首页> 外文期刊>Physical review >Spin reorientation driven by the interplay between spin-orbit coupling and Hund's rule coupling in iron pnictides
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Spin reorientation driven by the interplay between spin-orbit coupling and Hund's rule coupling in iron pnictides

机译：铁离子中自旋轨道耦合和洪德法则耦合之间的相互作用驱动自旋重取向

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摘要

In most magnetically-ordered iron pnictides, the magnetic moments lie in the FeAs planes, parallel to the modulation direction of the spin stripes. However, recent experiments in hole-doped iron pnictides have observed a reorientation of the magnetic moments from in-plane to out-of-plane. Interestingly, this reorientation is accompanied by a change in the magnetic ground state from a stripe antiferromagnet to a tetragonal nonuniform magnetic configuration. Motivated by these recent observations, here we investigate the origin of the spin anisotropy in iron pnictides using an itinerant microscopic electronic model that respects all the symmetry properties of a single FeAs plane. We find that the interplay between the spin-orbit coupling and the Hund's rule coupling can account for the observed spin anisotropies, including the spin reorientation in hole-doped pnictides, without the need to invoke orbital or nematic order. Our calculations also reveal an asymmetry between the magnetic ground states of electron- and hole-doped compounds, with only the latter displaying tetragonal magnetic states.
机译：在大多数磁性排序的铁素化物中，磁矩位于FeAs平面中，平行于自旋条纹的调制方向。但是，最近在掺杂空穴的铁素化物中进行的实验已经观察到磁矩从平面内到平面外的重新定向。有趣的是，这种重新定向伴随着磁性基态从条状反铁磁体到四方不均匀磁性构型的变化。受这些最新观察的启发，在这里，我们使用尊重单个FeAs平面的所有对称特性的流动电子显微镜研究了铁素化物中自旋各向异性的起源。我们发现，自旋轨道耦合和洪德法则耦合之间的相互作用可以解释所观察到的自旋各向异性，包括掺杂空穴的pnictides中的自旋重新取向，而无需调用轨道或向列顺序。我们的计算还揭示了电子和空穴掺杂化合物的磁性基态之间的不对称性，只有后者显示了四方磁性态。

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  • 来源
    《Physical review》 |2015年第21期|214509.1-214509.16|共16页
  • 作者

    Morten H. Christensen; Jian Kang; Brian M. Andersen; Ilya Eremin; Rafael M. Fernandes;

  • 作者单位

    School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA,Niels Bohr Institute, University of Copenhagen, DK-2100, Denmark;

    School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA;

    Niels Bohr Institute, University of Copenhagen, DK-2100, Denmark;

    Institut fuer Theoretische Physik Ⅲ, Ruhr-Universitaet Bochum, 44801 Bochum, Germany,National University of Science and Technology 'MISiS', 119049 Moscow, Russian Federation;

    School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA;

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  • 正文语种 eng
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  • 关键词

    magnetic properties;

    机译：磁性;

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