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Role of polar nanoregions with weak random fields in Pb-based perovskite ferroelectrics

By Helal M. A., Aftabuzzaman M., Tsukada S., Kojima S. and 小島 誠治

Abstract

In relaxor ferroelectrics, the role of randomly orientated polar nanoregions (PNRs) with weak random fields (RFs) is one of the most puzzling issues of materials science. The relaxation time of polarization fluctuations of PNRs, which manifests themselves as a central peak (CP) in inelastic light scattering, is the important physical quantity to understand the dynamics of PNRs. Here, the angular and temperature dependences of depolarized and polarized CPs in 0.44Pb(Mg1/3Nb2/3)O3-0.56PbTiO3 single crystals with weak RFs have been studied by Raman and Brillouin scattering, respectively. The CPs observed in Raman scattering show the very clear angular dependence which is consistent with the local tetragonal symmetry. It is different from the well-known local rhombohedral symmetry with strong RFs for Pb(Mg1/3Nb2/3)O3. In Brillouin scattering, depolarized and polarized CPs show two relaxation processes corresponding to transverse and longitudinal fluctuations of PNRs. The remarkable slowing down towards the Curie temperature was observed for transverse fluctuations in local tetragonal symmetry

Publisher: 'Springer Science and Business Media LLC'
Year: 2017
DOI identifier: 10.1038/srep44448
OAI identifier: oai:tsukuba.repo.nii.ac.jp:00046281
Provided by: Tsukuba Repository
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