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Landau model of the smectic C-isotropic phase transition

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48589

Pleiner,  Harald
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons47665

Brand,  H. R.
MPI for Polymer Research, Max Planck Society;

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Zitation

Mukherjee, P. K., Pleiner, H., & Brand, H. R. (2002). Landau model of the smectic C-isotropic phase transition. Journal of Chemical Physics, 117(16), 7788-7792.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-64CA-2
Zusammenfassung
We propose a Landau model to describe the smectic C-isotropic phase transition. A general Landau theory for the coupled orientational and translational order parameters and including the tilt angle is developed. The conditions for the smectic C- isotropic phase transition and the stability conditions of the smectic C phase are calculated. On the basis of this model it is argued that the smectic C-isotropic phase transition is always first order. We present a detailed analysis of the question under which conditions a direct smectic C-isotropic phase transition prevails in comparison to smectic A-isotropic and nematic-isotropic transitions. The theoretical results are found to be in qualitative agreement with all published experimental results. (C) 2002 American Institute of Physics.