Linear dichroic x-ray absorption response of Ti-Ti dimers along the c axis in Ti
2O3 upon Mg substitution

Okawa, M.; Takegami, D.; Christovam, D. S.; Ferreira-Carvalho, M.; Kuo, C.-Y.; Chen, C.T.; Miyoshino, T.; Takasu, K.; Okuda, T.; Chang, C. F.; Tjeng, L. H.; Mizokawa, T.

doi:10.1103/PhysRevB.108.195108

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Linear dichroic x-ray absorption response of Ti-Ti dimers along the c axis in Ti₂O₃ upon Mg substitution

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Takegami, D.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Christovam, D. S.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ferreira-Carvalho, M.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kuo, C.-Y.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Chang, C. F.
Chun-Fu Chang, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng, L. H.
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Okawa, M., Takegami, D., Christovam, D. S., Ferreira-Carvalho, M., Kuo, C.-Y., Chen, C., et al. (2023). Linear dichroic x-ray absorption response of Ti-Ti dimers along the c axis in Ti₂O₃ upon Mg substitution. Physical Review B, (19): 195108, pp. 1-6. doi:10.1103/PhysRevB.108.195108.

Cite as: https://hdl.handle.net/21.11116/0000-000E-0169-B

Abstract

Corundum oxide Ti2O3 shows the metal-insulator transition around 400-600 K accompanying the nearest Ti3+-Ti3+ bond (a1ga1g singlet state) formation along the c axis. In order to clarify the hole-doping effect for the a1ga1g singlet bond in Ti2O3, we investigated Ti 3d orbital anisotropy between corundum-type Ti2O3 and ilmenite-type MgTiO3 using linear dichroism of soft x-ray absorption spectroscopy of the Ti L2,3 edge. From the linear dichroic spectral weight in MgyTi2-yO3, we confirmed that the a1ga1g state is dominant not only in y=0.01 (almost Ti2O3), but also in y=0.29, indicating that the Ti-Ti bond survives against a certain level of hole doping. In y=0.63 corresponding to 46% hole doping per Ti, the 3d orbital symmetry changes from a1g to egπ. © 2023 American Physical Society.