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Protracted Kondo screening and kagome bands in the heavy-fermion metal

机译：长期的Kondo筛选和kagome乐队在重型金属

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摘要

Ce_3Al is an archetypal heavy-fermion compound with multiple crystalline phases. Here, we try to investigate its electronic structures in the hexagonal phase (α-Ce_3Al) and cubic phase (β-Ce_3Al) by means of a combination of density functional theory and single-site dynamical mean-field theory. We confirm that the 4/ valence electrons in both phases are itinerant, accompanied by strong valence state fluctuations. Their 4f band structures are heavily renormalized by electronic correlations, resulting in large effective electron masses. The Kondo screening in both phases would be protracted over a wide range of temperature since the single-impurity Kondo temperature T_K is much higher than the coherent Kondo temperature T_K*. Especially, the crystal structure of α-Ce_3Al forms a layered kagome lattice. We observe conspicuous kagome-derived flat bands and Dirac cones (or gaps) in its quasiparticle band structure. Therefore, it is suggested that the hexagonal phase of Ce_3Al is a promising candidate for a heavy-fermion kagome metal.
机译：CE_3AL是具有多个结晶相的型原子型重型化合物。这里，我们尝试通过密度泛函理论和单站点动态平均场理论的组合来研究六边形相（α-CE_3AL）和立方相（β-CE_3AL）中的电子结构。我们确认两个阶段中的4个/价电子是潮气的，伴随着强的价值强烈波动。它们的4F带结构通过电子相关性而严重重整，导致大有效的电子质量。由于单杂质Kondo温度T_K远高于相干kondo温度T_K *，因此两个阶段中的Kondo筛选都会在很多温度范围内延伸。特别是，α-Ce_3Al的晶体结构形成层状的kagome格子。我们在其Quasiparticle Band结构中观察到显眼的Kagome衍生的平带和Dirac锥体（或间隙）。因此，建议CE_3AL的六边形阶段是重型铁饼kagome金属的有希望的候选者。

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  • 来源
    《Physical review》 |2020年第15期|155140.1-155140.9|共9页
  • 作者

    Li Huang; Haiyan Lu;

  • 作者单位

    Science and Technology on Surface Physics and Chemistry Laboratory P.O. Box 9-35 Jiangyou 621908 China;

    Science and Technology on Surface Physics and Chemistry Laboratory P.O. Box 9-35 Jiangyou 621908 China;

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