Journal
PHYSICAL REVIEW B
Volume 90, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.041112
Keywords
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Funding
- NSERC
- CFI
- OMRI
- Canada Research Chair program
- Canada Foundation for Innovation under Compute Canada
- Government of Ontario
- Ontario Research Fund-Research Excellence
- University of Toronto
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- Government of Saskatchewan
- Western Economic Diversification Canada
- University of Saskatchewan
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We examine the role of spin-orbit coupling in the electronic structure of alpha-RuCl3, in which Ru ions in 4d(5) configuration form a honeycomb lattice. Our x-ray absorption spectroscopy measurements at the Ru L edges exhibit distinct spectral features associated with the presence of substantial spin-orbit coupling, as well as an anomalously large branching ratio. Furthermore the measured optical spectra can be described very well with first-principles electronic structure calculations obtained by taking into account both spin-orbit coupling and electron correlations. We propose that alpha-RuCl3 is a spin-orbit assisted Mott insulator, and that the bond-dependent Kitaev interaction may be important for understanding magnetism of this compound.
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