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Spin-orbit-induced orbital excitations in Sr 2 RuO 4 and Ca 2 RuO 4 : A resonant …

2015; American Physical Society; Volume: 91; Issue: 15 Linguagem: Inglês

10.1103/physrevb.91.155104

1550-235X

C. G. Fatuzzo, M. Dantz, Sara Fatale, P. Olalde-Velasco, N. E. Shaik, B. Dalla Piazza, S. Tóth, Jonathan Pelliciari, R. Fittipaldi, A. Vecchione, Naoki Kikugawa, J. S. Brooks, H. M. Rønnow, M. Grioni, Christian Rüegg, Thorsten Schmitt, J. Chang,

Multiferroics and related materials

High-resolution resonant inelastic x-ray scattering (RIXS) at the oxygen $K$ edge has been used to study the orbital excitations of ${\text{Ca}}_{2}{\text{RuO}}_{4}$ and ${\text{Sr}}_{2}{\text{RuO}}_{4}$. 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 ${\ensuremath{\lambda}}_{so}=200$ meV. The effects of spin-orbit interaction on the electronic structure and implications for the Mott and superconducting ground states of (Ca,Sr)${}_{2}\mathrm{RuO}{\phantom{\rule{0.16em}{0ex}}}_{4}$ are discussed.