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- W2022822471 abstract "Room-temperature Raman spectra of high-quality single-domain BaTi${mathrm{O}}_{3}$ crystals are reported. The frequencies of the Raman-active long-wavelength optical phonons are determined and shown to be in reasonable agreement with the Lyddane-Sachs-Teller (LST) relation as well as infrared reflectivity data. The effects of mode damping on the Raman line shape are discussed using a classical lattice-polarization-fluctuation model for the Raman scattering process. Based on this model, it is shown that the soft $E$ mode is overdamped, and at 25ifmmode^circelsetextdegreefi{}C has an undamped mode frequency ${ensuremath{omega}}_{mathrm{TO}}$ of 36ifmmodepmelsetextpmfi{}3 ${mathrm{cm}}^{ensuremath{-}1}$ and a damping constant $ensuremath{Gamma}$ of 1.1ifmmodepmelsetextpmfi{}0.1. The temperature dependence of ${ensuremath{omega}}_{mathrm{TO}}$ is given and found to be consistent with the LST relation. The soft ${A}_{1}$ mode is not observed, but is estimated from the LST relation and infrared reflectivity data to be heavily damped ($ensuremath{Gamma}ensuremath{approx}0.5$) and to have an undamped mode frequency of 180ifmmodepmelsetextpmfi{}10 ${mathrm{cm}}^{ensuremath{-}1}$." @default.
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- W2022822471 date "1968-10-10" @default.
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- W2022822471 title "Raman Spectrum of Single-Domain BaTi<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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- W2022822471 doi "https://doi.org/10.1103/physrev.174.522" @default.
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