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American Physical Society, Physical review B, 15(91), 2015

DOI: 10.1103/physrevb.91.155104

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Spin-orbit-induced orbital excitations inSr2RuO4andCa2RuO4: A resonant inelastic x-ray scattering study

Journal article published in 2015 by C. G. Fatuzzo, M. Dantz, S. Fatale, P. Olalde-Velasco, N. E. Shaik, B. Dalla Piazza, S. Toth, J. Pelliciari, R. Fittipaldi ORCID, A. Vecchione, N. Kikugawa ORCID, J. S. Brooks, H. M. Rønnow, M. Grioni, C.-H. Rüegg and other authors.
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This paper is available in a repository.

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Abstract

High-resolution resonant inelastic X-ray scattering (RIXS) at the oxygen K-edge has been used to study the orbital excitations of Ca2RuO4 and Sr2RuO4. In combination with linear dichroism X-ray absorption spectroscopy, the ruthenium 4d-orbital occupation and excitations were probed through their hybridization with the oxygen p-orbitals. These results are described within a minimal model, taking into account crystal field splitting and a spin-orbit coupling λ_{so}=200~meV. The effects of spin-orbit interaction on the electronic structure and implications for the Mott and superconducting ground states of (Ca,Sr)2RuO4 are discussed. ; Comment: accepted in PRB 2015