Breakdown of the Landau theory in isotropic nematogens as observed by the nonlinear dielectric effect method

The nonlinear dielectric effect (NDE) in the isotropic phase of 5-heptyl-2-(4′-cyanophenyl)-pyrimidine, a nematogen with strong dielectric anisotropy, was found to be more complex than the Kerr effect. The deviations from the ( T-T*) −1 type behavior of the NDE constant are due to the presence of a...

Full description

Saved in:
Bibliographic Details
Published in:Chemical physics 1990-04, Vol.142 (3), p.495-500
Main Author: PyŻuk, Wiesław
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The nonlinear dielectric effect (NDE) in the isotropic phase of 5-heptyl-2-(4′-cyanophenyl)-pyrimidine, a nematogen with strong dielectric anisotropy, was found to be more complex than the Kerr effect. The deviations from the ( T-T*) −1 type behavior of the NDE constant are due to the presence of a noncritical background as well as of a precritical slowing down that interferes with the newly observed singular non-mean-field contributions. Fluctuational corrections to the susceptibility are not the main reason of the latter, which yield an exponent higher than 2 when described by the power law.
ISSN:0301-0104
DOI:10.1016/0301-0104(90)80044-X