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

Lu, X; Olalde-Velasco, P; Huang, Y; Bisogni, V; Pelliciari, J; Fatale, S; Dantz, M; ... Schmitt, T; + view all (2018) Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K-edge resonant inelastic x-ray scattering. [Rapid communication]. Physical Review B: Condensed Matter and Materials Physics , 97 (4) , Article 041102(R). 10.1103/PhysRevB.97.041102. Green open access

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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 ∼ 0.8 eV. 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.

Type: Article
Title: Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K-edge resonant inelastic x-ray scattering
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.97.041102
Publisher version: https://doi.org/10.1103/PhysRevB.97.041102
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Antiferromagnetism, Excitons, Magnons, Iridates, Perovskite, Strongly correlated systems, Resonant inelastic x-ray scattering
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10040895
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