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Nematicity and Magnetism in FeSe and Other Families of Fe-Based Superconductors

机译:FESE基超导体的FESE和其他家庭中的念头和磁性

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Nematicity and magnetism are two key features in Fe-based superconductors, and their interplay is one of the most important unsolved problems. In FeSe, the magnetic order is absent below the structural transition temperature T str = 90 K , in stark contrast to the fact that the magnetism emerges slightly below T str in other families. To understand such amazing material dependence, we investigate the spin-fluctuation-mediated orbital order ( n x z ≠ n y z ) by focusing on the orbital-spin interplay driven by the strong-coupling effect, called the vertex correction. This orbital-spin interplay is very strong in FeSe because of the small ratio between the Hund’s and Coulomb interactions ( J ˉ / U ˉ ) and large d x z , d y z -orbital weight at the Fermi level. For this reason, in the FeSe model, the orbital order is established irrespective of the fact that the spin fluctuations are very weak, so the magnetism is absent below T str . In contrast, in the LaFeAsO model, the magnetic order appears just below T str both experimentally and theoretically. Thus, the orbital-spin interplay due to the vertex correction is the key ingredient in understanding the rich phase diagram with nematicity and magnetism in Fe-based superconductors in a unified way.
机译:向外性和磁性是Fe基超导体中的两个关键特征,它们的相互作用是最重要的未解决问题之一。在FESE中,磁性顺序不在结构转变温度t str = 90k下方,与其他家庭略低于T str略低于t str的事实,术语呈现。为了了解这种惊人的材料依赖性,我们通过专注于由强耦合效果驱动的轨道 - 自旋相互作用来研究自旋波动介导的轨道顺序(N X Z≠N Y Z),称为顶点校正。由于在FERMI水平下,FESE在FESE之间的比率小,因此在FESE中非常强烈,因此在FERMI水平下的大小为D X Z,D Y Z -BORBITL重量之间的比例很小。因此,在FESE模型中,无论旋转波动都是非常弱的事实,如何建立轨道顺序,因此磁性不在T STR以下。相比之下,在Lafeaso模型中,磁场显示在实验和理论上的t st中。因此,由于顶点校正引起的轨道 - 自旋相互作用是理解Fe基超导中的富相位图的关键成分,以统一的方式。

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