Scaling of diverging optical phonon linewidth in displacive ferroelectrics

Several families of displacive ferroelectrics which have diverging “soft-mode” linewidths are compared quantitatively with the theories of Levanyuk et al. and of Tagantsev and Gurevich. In agreement with predictions the linewidth divergences in ferroelectrics that the cubic and centric in their para...

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Bibliographic Details
Published in:Solid state communications 1986-06, Vol.58 (10), p.687-692
Main Authors: Scott, J.F., Sanjurjo, J.A.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Ferroelectricity and antiferroelectricity
Physics
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Summary:Several families of displacive ferroelectrics which have diverging “soft-mode” linewidths are compared quantitatively with the theories of Levanyuk et al. and of Tagantsev and Gurevich. In agreement with predictions the linewidth divergences in ferroelectrics that the cubic and centric in their paraelectric phases (PbTiO 3, PbTi 1− x Sn x O 3, GeTe, SrTiO 3 under stress) satisfy a universal scaling theory γ(T) = γ(0) t − 1 2 that has no adjustable parameters ( t is reduced temperature ( T c − T/ T c ), whereas in uniaxial ferroelectrics such as Pb 5Ge 3O 11 or LiNbO 3 the linewidths diverge more rapidly, as t −1.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(86)90502-8