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Spin-orbit-induced orbital excitations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Sr</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>RuO</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Ca</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>RuO</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>: A resonant …
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 …