Abstract
We study the influence of the dispersed aerosil particle concentration on the soft and Goldstone mode dynamics across the smectic-–smectic- phase transition using dielectric spectroscopy. We use CE8 liquid crystal filled with aerosils of concentrations and where and stand for masses of aerosil and liquid crystal, respectively. In dispersions with the characteristic Goldstone frequency temperature dependence is almost bulklike in contrast to the corresponding soft mode dependence For the degeneracy of the modes at the transition temperature is lifted. With increasing x the modes’ intensities gradually decrease and the critical effective coefficient tentatively approaches the value characterizing the three-dimensional universality class. For a drastic change in behavior is observed. The Goldstone mode is completely suppressed and the dependence begins to deviate from the Arrhenius behavior. A simple phenomenological approach is used in the explanation of results.
- Received 27 May 2002
DOI:https://doi.org/10.1103/PhysRevE.66.041702
©2002 American Physical Society