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Direct observation of the energy gain underpinning ferromagnetic superexchange in the electronic structure of CrGeTe$_3$
- Source :
- Phys. Rev. B 101, 205125 (2020)
- Publication Year :
- 2019
-
Abstract
- We investigate the temperature-dependent electronic structure of the van der Waals ferromagnet, CrGeTe$_3$. Using angle-resolved photoemission spectroscopy, we identify atomic- and orbital-specific band shifts upon cooling through ${T_\mathrm{C}}$. From these, together with x-ray absorption spectroscopy and x-ray magnetic circular dichroism measurements, we identify the states created by a covalent bond between the Te ${5p}$ and the Cr ${e_g}$ orbitals as the primary driver of the ferromagnetic ordering in this system, while it is the Cr ${t_{2g}}$ states that carry the majority of the spin moment. The ${t_{2g}}$ states furthermore exhibit a marked bandwidth increase and a remarkable lifetime enhancement upon entering the ordered phase, pointing to a delicate interplay between localized and itinerant states in this family of layered ferromagnets.
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 101, 205125 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1912.11314
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.101.205125