Microscopic Liquid Crystal Theory of Nematic Reentrance, Smectic C Ordering, and In-Plane Domain Formation
The frustrated spin-gas model with dipolar, van der Waals, and benzene-ring steric interactions is studied by Monte Carlo. Reentrant phase diagrams are obtained, with the sequence nematic-smectic Ad-nematic-smectic A1-smectic C. The reentrance mechanism is in terms of interpenetrating order and disorder. Layer tilting is found to be due to permeation-rotation lock-in. The smectic A1 and C phases occur in two versions, one pointing to in-plane domain formation. The phase diagrams are obtained by adapting the Lindemann melting criterion. Layer thicknesses, tilts, specific heats, and dimer concentrations are evaluated. The model explains three types of smectic C phases distinguished by tilt saturation. Results qualitatively agree with experiments.
KeywordsDipolar Interaction Monte Carlo Sampling Local Curvature Microscopic Theory Calculate Phase Diagram
Unable to display preview. Download preview PDF.
- 12.A. de Vries, in: “Liquid Crystals, the Fourth State of Matter,” by F. D. Seva, ed., Marcel Dekker, New York, (1979), p. 1.Google Scholar
- 14.P. Barois, Chapter 4 of this Volume (1991).Google Scholar
- 15.A.N. Berker, K. Hui, and J. Marko, to be published.Google Scholar
- 16.F. Hardouin, A.M. Levelut, M.F. Achard, and G. Sigaud, J. Chim. Phys. 80: 53 (1983).Google Scholar
- 18.A.R. Kortan, H. von Känel, R.J. Birgeneau, and J.D. Litster, J. Phys. (Paris) 45: 537 (1984).Google Scholar