Raman scattering inTi2O3-V2O3alloys
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Abstract
Raman scattering of single crystals of ${({\mathrm{Ti}}_{1\ensuremath{-}x}{\mathrm{V}}_{x})}_{2}{\mathrm{O}}_{3}$ with $0\ensuremath{\le}x\ensuremath{\le}0.3$ has been measured between 80 and 700 \ifmmode^\circ\else\textdegree\fi{}K. All seven Raman-active phonons of the ${D}_{3d}^{6}$ space-group symmetry were found to show appreciable changes in the frequency, linewidth, and relative intensity as a function of temperature and alloy composition composition in the vicinity of the semiconductor-to-metal transition. In particular, a marked anomaly was observed in the temperature behavior of the lowest frequency mode of ${A}_{1g}$ symmetry. For $x\ensuremath{\lesssim}0.04$ it shows an initial softening followed by a partial recovery in going through the transition temperature. Chi and Sladek have observed a similar decrease and partial recovery for the sound velocity in ${\mathrm{Ti}}_{2}$${\mathrm{O}}_{3}$. A qualitative discussion of some of these results is given in terms of the free-energy band-crossing model of Zeiger and co-workers.
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