期刊
SCIENTIFIC REPORTS
卷 12, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41598-022-05321-9
关键词
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资金
- Ministerio de Ciencia, Innovacion y Universidades [PGC2018-101464-B-I00, PGC2018-097520-A-I00, RED2018-102612-T]
- Beatriz Galindo fellowship [BG20/000777]
- Juan de la Cierva fellowship [IJC2019-041586-I]
- high-pressure laboratory at the ESRF [HC-3913]
This study presents an advanced experimental and theoretical model to explain the correlation between the electronic and local structure of Eu2+ in EuS compound. The pressure evolution of the crystal field plays a major role in triggering the observed electronic transitions from semiconductor to half-metal and finally to the metallic state.
An advanced experimental and theoretical model to explain the correlation between the electronic and local structure of Eu2+ in two different environments within a same compound, EuS, is presented. EuX monochalcogenides (X: O, S, Se, Te) exhibit anomalies in all their properties around 14 GPa with a semiconductor to metal transition. Although it is known that these changes are related to the 4f(7)5d(0) -> 4f(6)5d(1) electronic transition, no consistent model of the pressure-induced modifications of the electronic structure currently exists. We show, by optical and x-ray absorption spectroscopy, and by ab initio calculations up to 35 GPa, that the pressure evolution of the crystal field plays a major role in triggering the observed electronic transitions from semiconductor to the half-metal and finally to the metallic state.
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