Absence of temperature-dependent phonon anomalies in Sr2IrO4 and Sr3Ir2O7
SCIE
SCOPUS
- Title
- Absence of temperature-dependent phonon anomalies in Sr2IrO4 and Sr3Ir2O7
- Authors
- Sen, K.; Heid, R.; Souliou, S. M.; Boll, D.; Bosak, A.; Sung, N. H.; Bertinshaw, J.; Gretarsson, H.; Kim, B. J.; Weber, F.; Le Tacon, M.
- Date Issued
- 2022-01
- Publisher
- AMER PHYSICAL SOC
- Abstract
- Following previous works reporting an anomalous behavior of several zone-center optical phonons across the magnetic transition of square lattice iridates Sr2IrO4 and Sr3Ir2O7, we have investigated the lattice dynamics as a function of momentum in these materials by means of high-resolution inelastic x-ray scattering. The observed phonon energies and scattering intensities across the Brillouin zone are in excellent agreement with ab initio lattice dynamical calculations based on nonmagnetic density-functional-perturbation theory. Our results do not evidence any renormalization of the phonons at finite momentum across the magnetic transition of Sr2IrO4. The only anomalous behavior was detected for the in-plane polarized longitudinal-acoustic phonon branch in Sr3Ir2O7 , which anomalously softens towards low temperatures and might be related to anisotropic negative thermal expansion in this compound. No anomalies related to potential charge ordering were observed.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/110865
- DOI
- 10.1103/PhysRevB.105.045142
- ISSN
- 2469-9950
- Article Type
- Article
- Citation
- Physical Review b, vol. 105, no. 4, 2022-01
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- There are no files associated with this item.
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