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A central peak in light scattering from the relaxor-type ferroelectric Na 1/2Bi 1/2TiO 3

Abstract : 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).
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Submitted on : Thursday, March 24, 2022 - 7:24:46 AM
Last modification on : Friday, March 25, 2022 - 3:57:25 AM

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I. G. Siny, E. Husson, J. M. Beny, S. G. Lushnikov, E. A. Rogacheva, et al.. A central peak in light scattering from the relaxor-type ferroelectric Na 1/2Bi 1/2TiO 3. Physica B: Physics of Condensed Matter, 2001, 293, pp.382-389. ⟨10.1016/S0921-4526(00)00549-4⟩. ⟨insu-03618069⟩

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