Ti 3d Orbital Change Across Metal-Insulator Transition in Ti_2O_3 : Polarization-Dependent Soft X-ray Absorption Spectroscopy at Ti 2p Edge(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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The Ti 3d electronic structure of Ti_2O_3 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 520K in the metallic phase in comparison with that at 300K in the insulating phase, indicating a large change in a_<1g> and e^π_g 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 t_<2g> level splitting relative to the on-site exchange interaction.
社団法人日本物理学会の論文
2006-05-15