期刊
PHYSICAL REVIEW B
卷 80, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.195110
关键词
density functional theory; electron correlations; electron-phonon interactions; excitons; localised states; optical conductivity; spin-orbit interactions; strontium compounds
资金
- Ministry of Education, Science and Technology [2009-0080567]
- Korean Science and Engineering Foundation through the ARP [R17-2008-033-01000-0]
- Soongsil University Research Fund
- National Research Foundation of Korea [2008-0060612, 2008-56529, 과06A1102, 2009-0080567] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Direct For Mathematical & Physical Scien [0856234] Funding Source: National Science Foundation
- Division Of Materials Research [0856234] Funding Source: National Science Foundation
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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