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Representative Brillouin spectra at selected temperatures of -PSN crystals. There are two pairs of peaks in each spectrum and an additional Rayleigh peak at zero frequency (elastic and quasielastic scattering). One pair corresponds to the quasi-LA mode, the other pair corresponds to the quasi-TA mode, respectively. A relaxation mode (quasielastic scattering) is clearly observed near the elastic Rayleigh peak.
Temperature dependence of quasi-LA mode and its linewidth of -PSN. (a) Solid circles are linewidth values on heating and the open symbols represent the values on cooling. Inset (a) exhibits the relaxation time calculated from Eq. (1) (Ref. 20). (b) Solid circles represent the frequency of the -mode on heating, open symbols on cooling.
(a) Temperature dependence of the CP intensity of -PSN. (b) Temperature dependence of the CP linewidth; points are experimental data and the lines are fits to Eq. (2). (c) Temperature dependence of the relaxation time determined by the linewidth of CP and the relaxation time determined by the LA mode.
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