Covalent Mixing in the 2D Ferromagnet CrSiTe 3 Evidenced by Magnetic X-Ray Circular Dichroism
Covalent Mixing in the 2D Ferromagnet CrSiTe 3 Evidenced by Magnetic X-Ray Circular Dichroism
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磁 X 射线圆二色性证明了二维铁磁体 CrSiTe 3 中的共价混合
DOI：
10.1002/pssr.202100566
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Achinuq B
中科院分区：
文献类型：
--
作者：
Achinuq B
研究了范德华铁磁的低温电子结构。该铁磁半导体的磁体转变温度为33 K，单层和多层片的磁体转变温度可达80 K。X射线吸收光谱（XAS）和X射线磁圆二色性（XMCD）测量，在真空切割单晶的大边缘进行，给出了Cr原子之间杂化介导的超交换的有力证据。观察到的XAS中的化学位移，以及XMCD与计算的Crmultiplet光谱的比较，证实了Cr（）和Testates之间存在很强的共价键。XMCD和规则的应用给出了一个不消失的轨道矩，支持部分占据状态，除了。此外，在Teedge上出现的非零XMCD信号证实了由于与cr键合态混合而导致的Tespin极化。结果强烈表明，超交换，而不是先前提出的单离子各向异性，是造成低温铁磁有序的二维材料，如沙子。这证明了二维绝缘材料中电子相关和铁磁性之间的相互作用。
The low‐temperature electronic structure of the van der Waals ferromagnetis investigated. This ferromagnetic semiconductor has a magnetic bulk transition temperature of 33 K, which can reach up to 80 K in single‐ and few‐layer flakes. X‐ray absorption spectroscopy (XAS) and X‐ray magnetic circular dichroism (XMCD) measurements, carried out at the Crand Teedges in vacuo‐cleaved single crystals, give strong evidence for hybridization‐mediated superexchange between the Cr atoms. The observed chemical shift in the XAS, as well as the comparison of XMCD with the calculated Crmultiplet spectra, confirms a strong covalent bond between the Cr() and Testates. Application of the XMCD sum rules gives a nonvanishing orbital moment, supporting a partial occupation of thestates, apart from. Also, the presence of a nonzero XMCD signal at the Teedge confirms a Tespin polarization due to mixing with the Crbonding states. The results strongly suggest that superexchange, instead of the previously suggested single‐ion anisotropy, is responsible for the low‐temperature ferromagnetic ordering of 2D materials such asand. This demonstrates the interplay between electron correlation and ferromagnetism in insulating 2D materials.