# Spin-orbit-induced orbital excitations in ${\text{Sr}}_{2}{\text{RuO}}_{4}$ and ${\text{Ca}}_{2}{\text{RuO}}_{4}$: A resonant inelastic x-ray scattering study

Fatuzzo, C G; Dantz, M; Fatale, S; Olalde-Velasco, P; Shaik, N E; Dalla Piazza, B; Toth, S; Pelliciari, J; Fittipaldi, R; Vecchione, A; Kikugawa, N; Brooks, J S; Rønnow, H M; Grioni, M; Rüegg, C; Schmitt, T; Chang, J (2015). Spin-orbit-induced orbital excitations in ${\text{Sr}}_{2}{\text{RuO}}_{4}$ and ${\text{Ca}}_{2}{\text{RuO}}_{4}$: A resonant inelastic x-ray scattering study. Physical Review B, 91(15):online.

## Abstract

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 ${{\lambda}}_{so}=200$ meV. The effects of spin-orbit interaction on the electronic structure and implications for the Mott and superconducting ground states of (Ca,Sr)${}_{2}\mathrm{RuO}_{4}$ are discussed.

## Abstract

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 ${{\lambda}}_{so}=200$ meV. The effects of spin-orbit interaction on the electronic structure and implications for the Mott and superconducting ground states of (Ca,Sr)${}_{2}\mathrm{RuO}_{4}$ are discussed.

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