Abstract

A single crystal of the relaxor ${\text{PbMg}}_{1/3}{\text{Nb}}_{2/3}{\text{O}}_{3}$ is studied by hyper-Raman scattering. The relative scattering intensities obtained for the band near $250\text{ }{\text{cm}}^{\ensuremath{-}1}$ in various polarization geometries are fully compatible with hyper-Raman spectroscopy tensor of the ${F}_{2u}$ zone-center vibrational mode of prototype $Pm\overline{3}m$ $({O}_{h}^{1})$ cubic perovskite structure. The mode was investigated between room temperature and 775 K, thus covering the range around the Burns temperature ${T}_{d}$ and the crossover temperature ${T}^{\ensuremath{\ast}}$. At variance with recent anticipations, no softening was observed.

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