Brillouin scattering of SrTiO3under high pressure

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Abstract
The first study of pressure dependence of Brillouin scattering spectra in SrTiO3 up to 9 GPa is reported. The longitudinal and transverse acoustic velocities increase with increasing pressure up to 6 GPa, and show an anomaly near 6.5 GPa associated with a cubic-to-tetragonal structural phase transition. The transition pressure is in good agreement with the value expected from other data, showing the validity of the mean field approximation-in SrTiO3. The pressure dependence of the elastic constants is determined by means of the pressure-dependent density derived from the acoustic velocities in the cubic phase. The acoustic mode Grüneisen parameters of SrTiO3 are determined and discussed in comparison with those of NaCl.