Ti 3<i>d</i>Orbital Change Across Metal–Insulator Transition in Ti<sub>2</sub>O<sub>3</sub>: Polarization-Dependent Soft X-ray Absorption Spectroscopy at Ti 2<i>p</i>Edge

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  • Ti 3d Orbital Change Across Metal–Insulator Transition in Ti2O3: Polarization-Dependent Soft X-ray Absorption Spectroscopy at Ti 2p Edge

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The Ti 3d electronic structure of Ti2O3 across metal–insulator transition (MIT) has been investigated by means of polarization-dependent soft X-ray absorption spectroscopy (XAS) at the Ti 2p edge. The XAS spectra exhibit a remarkable linear dichroism (LD) between the polarization vectors of the incident light parallel and perpendicular to the Ti ion pair along the c-axis. LD intensity is significantly reduced at 520 K in the metallic phase in comparison with that at 300 K in the insulating phase, indicating a large change in a1g and egπ orbital occupations. The results are qualitatively consistent with a recent theory, where the MIT is due to the change of the 3d electronic configuration in the Ti pair along the c-axis driven by a change in the t2g level splitting relative to the on-site exchange interaction.

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