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• W2011550883 abstract "We report femtosecond time-resolved pump-probe DECP experiments using a colliding pulse mode-locked laser performed on ${mathrm{Ti}}_{2}$${mathrm{O}}_{3}$ as the sample lattice temperature ${mathit{T}}_{mathit{L}}$ is raised from 300 K through the ``soft transition'' at 450 K to a temperature of 570 K. We have observed DECP spectra through the transition, with oscillations in reflectivity of a few percent associated with the low frequency ${mathit{A}}_{1mathit{g}}$ mode. A thermodynamic relation is found between the low frequency ${mathit{A}}_{1mathit{g}}$ equilibrium displacement and the number of excited electrons removed from the valence band. When applied to ${mathit{T}}_{mathit{L}}$-dependent equilibrium coordinate data for ${mathrm{Ti}}_{2}$${mathrm{O}}_{3}$ obtained in x-ray experiments, the theory allows a determination of the band overlap vs lattice temperature. The band overlap at ${mathit{T}}_{mathit{L}}$=621 K is found to be ensuremath{sim}0.06 eV. The ${mathit{A}}_{1mathit{g}}$ mode frequency ${ensuremath{nu}}_{mathrm{ph}}$, the electronic relaxation rate (1/${mathrm{ensuremath{tau}}}_{mathrm{el}}$), and the phonon relaxation rate (1/${mathrm{ensuremath{tau}}}_{mathrm{ph}}$) have all been followed through the transition. ${ensuremath{nu}}_{mathrm{ph}}$ decreases, and shows a partial recovery in agreement with other Raman studies. The behavior of (1/${mathrm{ensuremath{tau}}}_{mathrm{}mathrm{el}}$) can be understood as due to an increase in available states for interband electron-phonon scattering as the band crossing takes place. Applying a deformation potential model to the data for (1/${mathrm{ensuremath{tau}}}_{mathrm{el}}$) before band crossing, with the low frequency ${mathit{A}}_{1mathit{g}}$ mode as the dominant scattering mechanism, a value of |D|ensuremath{simeq}2.0 eV is obtained for the valence band deformation potential associated with this mode. (1/${mathrm{ensuremath{tau}}}_{mathrm{ph}}$) does not show a clearcut correlation with bandcrossing due to greater scatter in the data. The temperature dependence is partially explained by the two-phonon decay of the coherent phonon excited in DECP, and may also have a component due to interaction with hot electrons as well as a dephasing contribution. textcopyright{} 1996 The American Physical Society." @default.
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• W2011550883 title "Femtosecond studies of the phase transition in<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>2</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>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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• W2011550883 doi "https://doi.org/10.1103/physrevb.54.105" @default.
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