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Compressive-strain induced enhancement of exchange interactions and short-range magnetic order in Sr$_2$IrO$_4$ investigated by Raman spectroscopy
- Source :
- Phys. Rev. B 100, 165106 (2019)
- Publication Year :
- 2019
-
Abstract
- We have carried out Raman spectroscopy experiments to investigate two-magnon excitations in epitaxial thin films of the quasi-two-dimensional antiferromagnetic Mott insulator Sr$_2$IrO$_4$ under in-plane misfit strain. With in-plane biaxial compression, the energy of the two-magnon peak increases, and the peak remains observable over a wider temperature range above the N\'eel temperature, indicating strain-induced enhancement of the superexchange interactions between $\it{J}_{eff}$ = 1/2 pseudospins. From density functional theory calculations, we have found an increase of the nearest-neighbor hopping parameter and exchange interaction with increasing biaxial compressive strain, in agreement with the experimental observations. Our experimental and theoretical results provide perspectives for systematic, theory-guided strain control of the primary exchange interactions in 5$\it{d}$ transition metal oxides.<br />Comment: 3 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 100, 165106 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1908.02716
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.100.165106