Abstract
We report on the temperature-dependent optical absorption spectra of an orthorhombic SrIrO3 thin film in the energy region between 0.08 and 6 eV. The optical absorption spectra show the characteristic spectral features associated with spin-orbit coupling-induced effective total angular momentum Jeff states. A Drude-like response from the electrons in the Jeff = 1/2 bands is observed in the energy region below about 0.5 eV followed by an interband transition from the Jeff = 3/2 to the Jeff = 1/2 bands at 0.7 eV. The electron excitations between the Jeff bands exhibit a strong temperature dependence that is different from the behavior of conventional metals. The spectral weight analysis of the absorption data suggests an anomalous low-frequency electrodynamic behavior for of SrIrO3.
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