Behavior of Optical Phonons near the Diffuse Phase Transition in Relaxor Ferroelectric PbMg1/3Ta2/3O3
arXiv:cond-mat/0409199 · doi:10.1103/PhysRevB.70.172101
Abstract
Raman scattering in relaxor ferroelectric PbMg1/3Ta2/3O3 (PMT) was investigated in the single crystalline form in the temperature range of 20 - 295 K. Anomalous temperature dependence of the integrated intensity and the Raman line contours were found at the diffuse phase transition. A correlation between the anomalies in the integrated intensities and the dispersion of the dielectric response was observed. The distortions of Raman lines with decreasing temperature are discussed.