Temperature dependence of the electronic structure of the J(eff)=12 Mott insulator Sr2IrO4 studied by optical spectroscopy
- Authors
- Moon, S. J.; Jin, Hosub; Choi, W. S.; Lee, J. S.; Seo, S. S. A.; Yu, J.; Cao, G.; Noh, T. W.; Lee, Y. S.
- Issue Date
- Nov-2009
- Publisher
- AMER PHYSICAL SOC
- Keywords
- density functional theory; electron correlations; electron-phonon interactions; excitons; localised states; optical conductivity; spin-orbit interactions; strontium compounds
- Citation
- PHYSICAL REVIEW B, v.80, no.19
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 80
- Number
- 19
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/15740
- DOI
- 10.1103/PhysRevB.80.195110
- ISSN
- 2469-9950
- Abstract
- We investigated the temperature-dependent evolution of the electronic structure of the J(eff)=1/2 Mott insulator Sr2IrO4 using optical spectroscopy. The optical conductivity spectra sigma(omega) of this compound has recently been found to exhibit two d-d transitions associated with the transition between the J(eff)=1/2 and J(eff)=3/2 bands due to the cooperation of the electron correlation and spin-orbit coupling. As the temperature increases, the two peaks show significant changes resulting in a decrease in the Mott gap. The experimental observations are compared with the results of first-principles calculation in consideration of increasing bandwidth. We discuss the effect of the temperature change in the electronic structure of Sr2IrO4 in terms of local lattice distortion, excitonic effect, electron-phonon coupling, and magnetic ordering.
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