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Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K -edge resonant inelastic x-ray scattering

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Lu Xingye, Olalde-Velasco Paul, Huang Yaobo, Bisogni Valentina, Pelliciari Jonathan, Fatale Sara, Dantz Marcus, Vale James G., Hunter E. C., Chang Johan, Strocov Vladimir N., Perry R. S., Grioni Marco, McMorrow D. F., Rønnow Henrik M., Schmitt Thorsten,
Project Coupled spin, charge and orbital dynamics of low-dimensional cuprates
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 97(4)
Page(s) 041102 - 041102
Title of proceedings Physical Review B
DOI 10.1103/physrevb.97.041102

Open Access

URL https://export.arxiv.org/abs/1712.06895
Type of Open Access Repository (Green Open Access)

Abstract

Resonant inelastic x-ray scattering (RIXS) experiments performed at the oxygen K edge on the iridate perovskites Sr2IrO4 and Sr3Ir2O7 reveal a sequence of well-defined dispersive modes over the energy range up to ∼0.8eV. The momentum dependence of these modes and their variation with the experimental geometry allows us to assign each of them to specific collective magnetic and/or electronic excitation processes, including single and bimagnons, and spin-orbit and electron-hole excitons. We thus demonstrate that dispersive magnetic and electronic excitations are observable at the O K edge in the presence of the strong spin-orbit coupling in the 5d shell of iridium and strong hybridization between Ir 5d and O 2p orbitals, which confirm and expand theoretical expectations. More generally, our results establish the utility of O K-edge RIXS for studying the collective excitations in a range of 5d materials that are attracting increasing attention due to their novel magnetic and electronic properties. Especially, the strong RIXS response at O K edge opens up the opportunity for investigating collective excitations in thin films and heterostructures fabricated from these materials.
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