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- W2028039636 abstract "We present and discuss photoemission (PES) and O 1s x-ray-absorption spectra (XAS) of ${mathrm{Ti}}_{4}$${mathrm{O}}_{7}$ taken at different temperatures in the range 50--300 K. The PES taken at 300 K show Ti 3d bands at the Fermi level and O 2p bands at higher binding energies. The Ti 3d bands shift approximately 0.25 eV towards higher binding energies in the low-temperature semiconducting phase (50 K). The O 1s XAS are related, via the corresponding metal-oxygen hybridization, to the unoccupied electronic states in the conduction band. The XAS taken at 300 K reflect Ti 3d bands at threshold and Ti 4sp bands at higher photon energies. The Ti 3d bands are split by crystal-field effects into ${mathit{t}}_{2mathit{g}}$ and ${mathit{e}}_{mathit{g}}$ subbands and shift approximately 0.45 eV towards higher photon energies in the low-temperature semiconducting phase (80 K). The XAS are basically temperature independent in both the low-temperature semiconducting phase and in the high-temperature metallic phase. The main changes in the O 1s XAS appear rather suddenly at the semiconductor-metal transition around 150 K." @default.
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- W2028039636 date "1995-04-15" @default.
- W2028039636 modified "2023-09-26" @default.
- W2028039636 title "Changes in the electronic structure of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ti</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>across …" @default.
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- W2028039636 doi "https://doi.org/10.1103/physrevb.51.10150" @default.
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