%0 Journal Article
%T Sotf mode in cubic PbTiO3 by hyper-Raman scattering
%+ Institute of Physics [Prague]
%+ Laboratoire Charles Coulomb (L2C)
%+ Institut of Physics, University of Silesia
%A Hlinka, J.
%A Hehlen, Bernard
%A Kania, A.
%A Gregora, I.
%< avec comité de lecture
%Z L2C:13-034
%@ 1098-0121
%J Physical Review B: Condensed Matter and Materials Physics (1998-2015)
%I American Physical Society
%N 87
%P 064101
%8 2013-02-04
%D 2013
%R 10.1103/PhysRevB.87.064101
%K PbTiO3
%K Ferroelectric
%K soft mode
%K hyper-Raman
%Z Physics [physics]/Condensed Matter [cond-mat]/Disordered Systems and Neural Networks [cond-mat.dis-nn]Journal articles
%X Hyper-Raman scattering experiments allowed collecting the spectra of the lowest F1u-symmetry mode of PbTiO3 crystal in the paraelectric phase up to ≈930 K as well as down to about 1 K above the phase transition. It is realized that this mode is fully responsible for the Curie-Weiss behavior of its dielectric permittivity above Tc. Near the phase transition, this phonon frequency softens down to 17 cm-1 and its spectrum can be well modeled as a response of a single damped harmonic oscillator. It is concluded that PbTiO3 constitutes a clean example of a soft-mode-driven ferroelectric system.
%G English
%2 https://hal.science/hal-00797857/document
%2 https://hal.science/hal-00797857/file/PhysRevD.92.pdf
%L hal-00797857
%U https://hal.science/hal-00797857
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021