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Soft Matter and Biological Physics

Eur. Phys. J. E 4, 293-297

Simple Landau model of the smectic-A-isotropic phase transition

P.K. Mukherjee1, 2, H. Pleiner3 and H.R. Brand1

1  Theoretische Physik III, Universität Bayreuth, D-95540 Bayreuth, Germany
2  Department of Physics, Haldia Govt. College, P.O.-Debhog, Dist.-Midnapur, Pin-721657, India
3  Max-Planck-Institut für Polymerforschung, 55021 Mainz, Germany


(Received 27 June 2000)

A simple Landau-type free energy function is presented to describe the smectic-A-isotropic phase transition. Varying the coupling between orientational and positional order parameters, a smectic-A-isotropic or a nematic-isotropic phase transition occurs. Within this model the smectic-A-isotropic phase transition is found to be always more strongly first order than the nematic-isotropic phase transition. The theoretical results are found to be in good agreement with all published experimental results.

64.70.Md - Transitions in liquid crystals.
05.70.Fh - Phase transitions: general studies.
61.30.-v - Liquid crystals.

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2001