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- W2031792070 abstract "We report an investigation of the uniaxial-stress dependence of the first-order Raman spectrum of rutile (Ti${mathrm{O}}_{2}$). We find a normal-mode behavior, characterized by an increase in the phonon frequency versus uniaxial compression, for the two Raman modes ${ensuremath{Gamma}}_{1}$ (${A}_{1g}$) and ${ensuremath{Gamma}}_{5}$ (${E}_{g}$). We deduce two deformation potentials for ${ensuremath{Gamma}}_{1}$ (in unit of ${mathrm{cm}}^{ensuremath{-}1}$): ${a}_{1}=ensuremath{-}610$ ${mathrm{cm}}^{ensuremath{-}1}$, ${b}_{1}=ensuremath{-}820$ ${mathrm{cm}}^{ensuremath{-}1}$ and four deformation potentials for ${ensuremath{Gamma}}_{5}$ (doubly degenerate mode): ${a}_{5}=ensuremath{-}1170$ ${mathrm{cm}}^{ensuremath{-}1}$, ${b}_{5}=ensuremath{-}1840$ ${mathrm{cm}}^{ensuremath{-}1}$, ${c}_{5}=+35$ ${mathrm{cm}}^{ensuremath{-}1}$, and ${d}_{5}=ensuremath{-}230$ ${mathrm{cm}}^{ensuremath{-}1}$. We find less classical results for ${ensuremath{Gamma}}_{3}$ (${B}_{1g}$): the phonon frequency increases for uniaxial stress parallel to $stackrel{ensuremath{rightarrow}}{mathrm{c}}$ but decreases for uniaxial stress parallel to $stackrel{ensuremath{rightarrow}}{mathrm{a}}$ ([100] direction) or parallel to ${stackrel{ensuremath{rightarrow}}{mathrm{a}}}^{ensuremath{'}}$ ([110] direction). The corresponding deformation potentials are ${a}_{3}=+620$ ${mathrm{cm}}^{ensuremath{-}1}$ and ${b}_{3}=+330$ ${mathrm{cm}}^{ensuremath{-}1}$. Within experimental error, all phonon energies displace linearly versus deformation." @default.
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- W2031792070 date "1980-02-15" @default.
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- W2031792070 title "Uniaxial-stress dependence of the first-order Raman spectrum of rutile. I. Experiments" @default.
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- W2031792070 doi "https://doi.org/10.1103/physrevb.21.1617" @default.
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