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Spin-orbit-induced orbital excitations in Sr2RuO4 and Ca2RuO4: A resonant inelastic x-ray scattering study

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2015
Author Fatuzzo C. G., Dantz M., Fatale S., Olalde-Velasco P., Shaik N. E., Piazza B. Dalla, Toth S., Pelliciari J., Fittipaldi R., Vecchione A., Kikugawa N., Brooks J. S., Ronnow H. M., Grioni M., Rueegg Ch., Schmitt T., Chang J.,
Project Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
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Original article (peer-reviewed)

Journal PHYSICAL REVIEW B
Volume (Issue) 91(15)
Page(s) 155104
Title of proceedings PHYSICAL REVIEW B
DOI 10.1103/PhysRevB.91.155104

Open Access

URL https://infoscience.epfl.ch/record/207625?ln=en
Type of Open Access Repository (Green Open Access)

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 λso=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.
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