An experimental study of the smectic A-smectic C transitions in monolayer, partially bilayer and bilayer systems

Krishna Prasad, S. ; Shankar Rao, D. S. ; Raja, V. N. ; Chandrasekhar, S. ; Heppke, G. ; Neubert, M. E. (1994) An experimental study of the smectic A-smectic C transitions in monolayer, partially bilayer and bilayer systems Molecular Crystals and Liquid Crystals, 238 . pp. 241-247. ISSN 1058-725X

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Related URL: http://dx.doi.org/10.1080/10587259408046931

Abstract

The smectic A-smectic C (A-C) transition in several compounds has been shown to be mean-field-like (MF) with a substantial tricritical crossover effect. However, a simple MF behaviour, i.e., with negligible tricritical influence, had not been reported till recently. The heat capacity measurements of the MIT group in two compounds exhibiting the bilayer A2-C2 transition revealed such a behaviour. It is of interest to investigate whether a simple MF behaviour can be observed for partially bilayer AdminusCd and monolayer A1-C1 transitions also. We report the first systematic order parameter measurements in the vicinity of the A2-C2, Ad-Cd and A1-C1 transitions. The data analysed in terms of power law and extended mean field expressions provide clear evidence of a simple MF behaviour in all three cases. The significance of this result is discussed.

Item Type:Article
Source:Copyright of this article belongs to Taylor and Francis Ltd.
Keywords:Smectic A-smectic C Transition; Tilt Angle Measurements; Mean-field Model
ID Code:7706
Deposited On:25 Oct 2010 10:46
Last Modified:16 May 2016 17:51

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