Pressure-induced electronic transitions in samarium monochalcogenides

Pressure-induced electronic transitions in samarium monochalcogenides
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单硫族化钐中压力诱导的电子跃迁

DOI:
10.1103/physrevb.105.195135
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发表时间:
2022
期刊:
影响因子:
3.7
通讯作者:
Banerjee D
Banerjee D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Banerjee D

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压力诱导的同构绝缘体到金属的转变SmS的特征在于存在一个中间价态,在较高的压力下,不能被捕获的密度泛函理论。作为一个直接的结果,包括在动态平均场理论中的电荷和自旋涨落,我们看到绝缘和金属相的出现,随着压力的增加,作为一个功能的变化价。这是伴随着显着改善的预测的平衡晶格常数和体积模量的所有Sm monocalcohalcogenides验证实验。轻推弹性带分析揭示了绝缘状态具有有限的准粒子重量,随着差距的关闭而减小,使得过渡不是Mott状的,并将这些材料归类为相关带绝缘体。这些跃迁的不连续和连续性质之间的差异可以归因于SmS中与SmSe和SmTe相比,在预测的金属态中,急剧共振的Sm-4峰与费米能级的接近程度。
The pressure-induced isostructural insulator-to-metal transition for SmS is characterized by the presence of an intermediate valence state at higher pressure which cannot be captured by density functional theory. As a direct outcome of including the charge and spin fluctuations incorporated in dynamical mean-field theory, we see the emergence of insulating and metallic phases with increasing pressure as a function of changing valence. This is accompanied by significantly improved predictions of the equilibrium lattice constants and bulk moduli for all Sm monochalcogenides verifying experiments. Nudged elastic band analysis reveals the insulating states to have a finite quasiparticle weight, decreasing as the gap closes rendering the transition to be not Mott-like, and classifies these materials as correlated band insulators. The difference between the discontinuous and continuous natures of these transitions can be attributed to the closeness of the sharply resonant Sm-4peaks to the Fermi level in the predicted metallic states in SmS compared with SmSe and SmTe.
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