%0 Journal Article
%T Soft Mode Doublet in PbMg1/3Nb2/3O3 Relaxor Investigated with Hyper-Raman Scattering
%+ Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM)
%+ Laboratoire des colloïdes, verres et nanomatériaux (LCVN)
%+ Institute of Physics [Prague]
%A Al-Zein, A.
%A Hlinka, J.
%A Rouquette, Jérôme
%A Hehlen, B.
%< avec comité de lecture
%@ 0031-9007
%J Physical Review Letters
%I American Physical Society
%V 105
%N 01
%P 017601
%8 2010-06-29
%D 2010
%R 10.1103/PhysRevLett.105.017601
%K Hyper raman
%K PMN
%K relaxeur
%Z 77.80.-e, 63.20.-e, 78.30.-j
%Z Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]Journal articles
%X Hyper-Raman scattering experiments suggest that a splitting of the lowest F1u-symmetry mode of PbMg1/3Nb2/3O3 crystal occurs in a wide temperature range around its Burns temperature Td≈630  K. The upper-frequency component, earlier investigated by inelastic neutron scattering experiments above Td, appears to be underdamped even hundred of degrees below Td. The lower-frequency component, known below Td from far-IR spectroscopy, actually becomes underdamped above Td. This suggests that the lower-frequency mode is the “primary” polar soft mode of PbMg1/3Nb2/3O3, responsible for the Curie-Weiss behavior of its dielectric permittivity above Td.
%G English
%L hal-00527762
%U https://hal.science/hal-00527762
%~ CNRS
%~ UNIV-MONTP1
%~ UNIV-MONTP2
%~ ENSC-MONTPELLIER
%~ ICG
%~ LCVN
%~ INC-CNRS
%~ CHIMIE
%~ UNIV-MONTPELLIER
%~ UM1-UM2
%~ TEST2-HALCNRS