论文标题
重毛皮金属CE $ _ {3} $ al
Protracted Kondo screening and kagome bands in heavy-fermion metal Ce$_{3}$Al
论文作者
论文摘要
CE $ _ {3} $ Al是一种具有多个结晶阶段的原型重毛。在这里，我们尝试通过密度功能理论和单个site函数理论的结合组合在六角阶段（$α$ -ce $ _ {3} $ al）和立方相（$β$ -ce $ _ {3} $ al）调查其电子结构。我们确认，这两个阶段中的4美元$ f $ valence电子都巡回演出，并伴随着强大的价状态波动。它们的4 $ f $带结构通过电子相关性重新归一化，从而导致较大的有效电子质量。 CE $ _ {3} $ Al中的Kondo筛选将在广泛的温度下持久，因为单突击kondo温度$ t_ {k} $远高于连贯的Kondo温度$ t^{*} _ {k {k} $。特别是，$α$ -ce $ _ {3} $ al的晶体结构形成了分层的kagome晶格。我们观察到其在其准粒子带结构中具有显着的kagome衍生的扁平带和狄拉克锥（或间隙）。因此，可以得出结论，CE $ _ {3} $ al的六角形阶段将是重型武装kagome金属的有前途的候选人。
Ce$_{3}$Al is an archetypal heavy-fermion compound with multiple crystalline phases. Here, we try to investigate its electronic structures in the hexagonal phase ($α$-Ce$_{3}$Al) and cubic phase ($β$-Ce$_{3}$Al) by means of a combination of density functional theory and single-site dynamical mean-field theory. We confirm that the 4$f$ valence electrons in both phases are itinerant, accompanied with strong valence state fluctuations. Their 4$f$ band structures are heavily renormalized by electronic correlations, resulting in large effective electron masses. The Kondo screening in Ce$_{3}$Al 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$_{3}$Al 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 concluded that the hexagonal phase of Ce$_{3}$Al will be a promising candidate of heavy-fermion kagome metal.
