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.
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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 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: | https://discovery.ucl.ac.uk/id/eprint/10040895 |
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