1. Covalent Mixing in the 2D Ferromagnet CrSiTe3 Evidenced by Magnetic X‐Ray Circular Dichroism.
- Author
-
Achinuq, Barat, Fujita, Ryuji, Xia, Wei, Guo, Yanfeng, Bencok, Peter, van der Laan, Gerrit, and Hesjedal, Thorsten
- Subjects
- *
MAGNETIC circular dichroism , *FERROMAGNETIC materials , *MAGNETIC transitions , *ELECTRON configuration , *MAGNETIC semiconductors - Abstract
The low‐temperature electronic structure of the van der Waals ferromagnet CrSiTe3 is 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 Cr L2,3 and Te M5 edges 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 Cr L2,3 multiplet spectra, confirms a strong covalent bond between the Cr 3d(eg) and Te 5p states. Application of the XMCD sum rules gives a nonvanishing orbital moment, supporting a partial occupation of the eg states, apart from t2g. Also, the presence of a nonzero XMCD signal at the Te M5 edge confirms a Te 5p spin polarization due to mixing with the Cr eg bonding 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 as CrSiTe3 and CrGeTe3. This demonstrates the interplay between electron correlation and ferromagnetism in insulating 2D materials. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF