%0 Journal Article
%T A central peak in light scattering from the relaxor-type ferroelectric Na 1/2Bi 1/2TiO 3
%+ Université d'Orléans (UO)
%+ Centre National de la Recherche Scientifique (CNRS)
%A Siny, I. G.
%A Husson, E.
%A Beny, J. M.
%A Lushnikov, S. G.
%A Rogacheva, E. A.
%A Syrnikov, P. P.
%< avec comité de lecture
%@ 0921-4526
%J Physica B: Condensed Matter
%I Elsevier
%V 293
%P 382-389
%8 2001
%D 2001
%Z 2001PhyB..293..382S
%R 10.1016/S0921-4526(00)00549-4
%Z Sciences of the Universe [physics]Journal articles
%X A complex perovskite-type single crystal Na 1/2Bi 1/2TiO 3 (NBT) has been studied by Raman scattering. A broad central component has been revealed to analyze the temperature dependence of its intensity and width for the first time. The central component has features of a relaxation mode with the highest intensity in the intertransition region, so it arises from a critical light scattering on fluctuations of two coupled order parameters. The correlations between the central component behaviour, acoustic anomalies and dielectric response as well as their relation to a model with competing interactions are discussed. It is suggested that the broad central peak component in light scattering is characteristic of the relaxor-type ferroelectrics with a sequence of phase transformation irrespective of whether transitions are really observed as in NBT or whether transitions are frustrated under normal conditions as in PbMg 1/3Nb 2/3O 3 (PMN).
%G English
%L insu-03618069
%U https://insu.hal.science/insu-03618069
%~ INSU
%~ CNRS
%~ UNIV-ORLEANS