Detection of Continuous Sm C*–Sm A Phase Transition in Electroclinic Liquid Crystals by Dielectric Method

概要

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The dielectric relaxation processes near the transition temperature ($T_{\text{c}}$) of Sm C*–Sm A phase transition in an electroclinic liquid crystal have been investigated in a homogeneously aligned cell of 2.5 μm thickness in the frequency range of 50 Hz to 10 MHz. No abrupt change in phase during the Sm C*–Sm A phase transition has been detected by the dielectic method; therefore no soft mode contribution to the dielectric permittivity near $T_{\text{c}}$ in the Sm C* phase has been found. It has also been observed that the dielectric strength ($\Delta\varepsilon$) near the transition temperature is very high. These two unusual behaviours of electroclinic liquid crystal material have been analyzed by means of theoretical calculations, taking into account the effect of the electric field in generalized Landau-type free energy densities ($\Delta F$). The experimental results in this study agree well with theoretical predictions.
2005-03-15