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Liquid crystals
Influence of nematic and smectic orders on polarizability of molecules of ethyl-$p$-(4-ethoxybenzylideneamino-)$\alpha$-methyl cinnamate liquid crystals
E. M. Aver'yanov L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
Abstract:
Experimental values of the polarizability tensor
$\gamma$ components of molecules of ethyl-
$p$-(4-ethoxybenzylideneamino-)
$\alpha$-methyl cinnamate liquid crystals in the nematic and smectic
$A$ phases have been obtained. Quadratic dependences of the longitudinal,
$\gamma_l$, and transverse,
$\gamma_t$, components, the mean value
$\bar{\gamma}$, and anisotropy
$\Delta\gamma$ in both phases have been established as functions of the orientational order parameter
$S$ of molecules in a maximally wide range of
$S$. The nematic-smectic
$A$ phase transition with a continuous variation of
$S$ manifests itself as kinks in the linear dependences of
$\bar{\gamma}$,
$\Delta\gamma$, and
$\gamma_l$ on
$S^2$ and does not influence the dependence
$\gamma_t(S^2)$. The observed dependences have been derived in the framework of the theory of the nematic-smectic
$A$ phase transition. The factors responsible for different influences of the orientational and positional orderings of molecules on the polarizability parameters have been determined.
Received: 23.04.2013
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