Abstract
The Brillouin light back-scattering spectra along the [001] phonon direction have been measured as a function of temperature (25–960 °C) for a BetaBaB2O4 (BBO) single crystal. As temperature increases, the longitudinal acoustic (LA) phonon frequency of BBO shows an obvious softening with a weak modification of slope near 500 °C. We propose that the structural transition (α-phase→β-phase) of BBO occurs near 500 °C and is first-order type. In addition, a broad damping evolution was observed and can be attributed to the dynamic order-parameter fluctuations. With the previous result, the LA[001] sound velocity VLA was also calculated at room temperature.
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