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Effect of dispersed silica particles on the smectic-A-smectic-C* phase transition | | Z Kutnjak
; S Kralj
; S Zumer
; | | Date: |
30 Sep 2002 | | Journal: | Phys Rev E, 66 (4 Pt 1), 041702 | | Abstract: | We study the influence of the dispersed aerosil particle concentration on the soft and Goldstone mode dynamics across the smectic-A-smectic-C* phase transition using dielectric spectroscopy. We use CE8 liquid crystal filled with aerosils of concentrations x=m(s)/(m(s)+m(LC))=0.025, 0.05, 0.1, and 0.15, where m(s) and m(LC) stand for masses of aerosil and liquid crystal, respectively. In dispersions with x<0.15 the characteristic Goldstone frequency temperature dependence f(G)(T) is almost bulklike in contrast to the corresponding soft mode dependence f(s)(T). For x>0 the degeneracy of the modes at the SmA-SmC* transition temperature is lifted. With increasing x the modes’ intensities gradually decrease and the critical effective coefficient gamma tentatively approaches the value characterizing the three-dimensional XY universality class. For x=0.15, a drastic change in behavior is observed. The Goldstone mode is completely suppressed and the f(s)(T) dependence begins to deviate from the Arrhenius behavior. A simple phenomenological approach is used in the explanation of results. | | Source: | PubMed, pmid12443218 | | Services: | Forum | Review | Favorites | |
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