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Brillouin spectroscopic measurements have been carried out on relaxorferroelectric Pb(Zn1/3Nb2/3)0.85Ti0.15O3 (PZN-PT) single crystal over thetemperature range 300-585 K. The longitudinal acoustic phonon begins to softenbelow 650 K, which is attributed to the Burns temperature (TB). On the otherhand, the line width of the longitudinal acoustic (LA) phonon mode exhibits asharp Landau-Khalatnikov-like maximum and an accompanying anomaly in the LAmode frequency around 463 K, the tetragonal-cubic phase transition temperature(Ttc). In addition, a broad central peak, found below the characteristicintermediate temperature T* ~ 525 K, exhibits critical slowing down uponapproaching Ttc indicating an order-disorder nature of the phase transition.The relaxation time of polar nano regions estimated from the broad central peakis found to be same as that obtained for LA phonon mode suggesting anelectrostrictive coupling between strain and polarization fluctuations. Theactivation energy for the PNRs relaxation-dynamics is found to be ~236 meV.Polarized nature of the central peak suggests that the polar nano regions havethe tendency to form long-range polar ordering.

Anomalous behavior of acoustic phonon mode and central peak in Pb(Zn1/3Nb2/3)0.85Ti0.15O3 single crystal studied using Brillouin scattering