Ti 3d orbital change across metal-insulator transition in Ti2O3 : Polarization-dependent soft X-ray absorption spectroscopy at Ti 2p edge
作者： Hitoshi Sato , Arata Tanaka , Masahiro Sawada , Fumitoshi Iga , Kenichio Tsuji
关键词: Metal–insulator transition 、 Linear dichroism 、 Molecular physics 、 Nuclear magnetic resonance 、 Electronic structure 、 Materials science 、 Energy level splitting 、 Electron configuration 、 Dichroism 、 X-ray absorption spectroscopy 、 Absorption spectroscopy
摘要: The Ti 3 d electronic structure of 2 O across metal–insulator transition (MIT) has been investigated by means polarization-dependent soft X-ray absorption spectroscopy (XAS) at the p edge. XAS spectra exhibit a remarkable linear dichroism (LD) between polarization vectors incident light parallel and perpendicular to ion pair along c -axis. LD intensity is significantly reduced 520 K in metallic phase comparison with that 300 insulating phase, indicating large change 1 g e π orbital occupations. results are qualitatively consistent recent theory, where MIT due configuration -axis driven t level splitting relative on-site exchange interaction.
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