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Electronically highly cubic conditions for Ru in alpha-RuCl3

MPS-Authors
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Agrestini,  S.
Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kuo,  C.-Y.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ko,  K.-T.
Kyung-Tae Ko, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hu,  Z.
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kasinathan,  D.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Henschel,  A.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schmidt,  M.
Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng,  L. H.
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Agrestini, S., Kuo, C.-Y., Ko, K.-T., Hu, Z., Kasinathan, D., Vasili, H. B., et al. (2017). Electronically highly cubic conditions for Ru in alpha-RuCl3. Physical Review B, 96(16): 161107, pp. 1-5. doi:10.1103/PhysRevB.96.161107.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002E-184B-F
Abstract
We studied the local Ru 4d electronic structure of alpha-RuCl3 by means of polarization-dependent x-ray absorption spectroscopy at the Ru L-2,L-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, alpha-RuCl3 is an ideal candidate for the realization of Kitaev physics.