Unraveling the 4f electronic structures of cerium monopnictides

Unraveling the 4f electronic structures of cerium monopnictides
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揭示单硝化铈的 4f 电子结构

DOI:
10.1088/1361-648x/abaa82
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发表时间:
2019-11
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
Li Huang
Li Huang
中科院分区:
其他
文献类型:
--
作者:
Haiyan Lu;Li Huang

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我们用最先进的第一性原理多体方法,即密度泛函理论和单位动力学平均场理论相结合,研究了CeX(其中X=N,P,As,Sb和Bi)中的4f电子结构。我们发现CEN中的4f电子是高度巡游和混价的,在费米能级附近有一个明显的准粒子峰。相反,它们在Cebi中变得很好地局域化,表现出微弱的价态涨落。这意味着当X原子从N改变为Bi时,可能会出现4f巡回局域交叉。此外,根据4f自能函数的低能行为,我们可以得出结论,CeX中的4f电子也表现出有趣的轨道选择电子关联,这与其他基于Ce的重费米子化合物类似。
We employed a state-of-the-art first-principles many-body approach, namely the density functional theory in combination with the single-site dynamical mean-field theory, to study the 4f electronic structures in cerium monopnictides (CeX, where X=N, P, As, Sb, and Bi). We find that the 4f electrons in CeN are highly itinerant and mixed-valence, showing a prominent quasiparticle peak near the Fermi level. On the contrary, they become well localized and display weak valence fluctuation in CeBi. It means that a 4f itinerant-localized crossover could emerge upon changing the X atom from N to Bi. Moreover, according to the low-energy behaviors of 4f self-energy functions, we could conclude that the 4f electrons in CeX also demonstrate interesting orbital-selective electronic correlations, which are similar to the other cerium-based heavy fermion compounds.
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