Large Temperature Dependent Spin Orbit Coupling in Electron-Electron Interaction Dominated Orthorhombic SrIrO3 Film

The spin orbit coupling in orthorhombic SrIrO3 film was studied at different temperatures via weak anti-localization effect. The spin orbit coupling increased with the increasing temperature in the regime of two dimensional variable range hopping conduction. Near linearly temperature dependent Rashba coefficient was manifested and interpreted through the electron correlation assisted evolution of Landé g factor, which was assumed to be linearly decrease with temperature rising. Moreover, the t2g band of orthorhombic SrIrO3 is not fully separated into Jeff=1/2 and Jeff=3/2 bands, as proved by the Landé g factor at zero temperature with a value of 1.0568 which is between that corresponding to non-splitted t2g band and that to fully splitted t2g band.