Electronically highly cubic conditions for Ru in α-RuCl 3

S. Agrestini, C. Y. Kuo, K. T. Ko, Z. Hu, D. Kasinathan, H. B. Vasili, J. Herrero-Martin, S. M. Valvidares, E. Pellegrin, L. Y. Jang, A. Henschel, M. Schmidt, A. Tanaka, L. H. Tjeng

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We studied the local Ru 4d electronic structure of α-RuCl 3 by means of polarization-dependent x-ray absorption spectroscopy at the Ru L 2,3 edges. We observed a vanishingly small linear dichroism indicating that electronically the Ru 4d local symmetry is highly cubic. Using full multiplet cluster calculations we were able to reproduce the spectra excellently and to extract that the trigonal splitting of the t 2g orbitals is −12 ± 10 meV, i.e., negligible as compared to the Ru 4d spin-orbit coupling constant. Consistent with our magnetic circular dichroism measurements, we found that the ratio of the orbital and spin moments is 2.0, the value expected for a J eff = 1 2 ground state. We have thus shown that as far as the Ru 4d local properties are concerned, α-RuCl 3 is an ideal candidate for the realization of Kitaev physics.

Original languageEnglish
Article number161107
JournalPhysical Review B
Issue number16
StatePublished - 2017

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    Agrestini, S., Kuo, C. Y., Ko, K. T., Hu, Z., Kasinathan, D., Vasili, H. B., Herrero-Martin, J., Valvidares, S. M., Pellegrin, E., Jang, L. Y., Henschel, A., Schmidt, M., Tanaka, A., & Tjeng, L. H. (2017). Electronically highly cubic conditions for Ru in α-RuCl 3. Physical Review B, 96(16), [161107]. https://doi.org/10.1103/PhysRevB.96.161107