Disordering to Order: de Vries behavior from a Landau theory for smectics

Details Disordering to Order: de Vries behavior from a Landau theory for smectics Disordering to Order: de Vries behavior from a Landau theory for smectics

2006-12-20

arxiv.org/abs/cond-mat/0612532v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 page appendix

Scientific paper

10.1103/PhysRevLett.98.197801

We show that Landau theory for the isotropic, nematic, smectic A, and smectic C phases generically, but not ubiquitously, implies de Vries behavior. I.e., a continuous AC transition can occur with little layer contraction; the birefringence decreases as temperature T is lowered above this transition, and increases again below the transition. This de Vries behavior occurs in models with unusually small orientational order, and is preceded by a first order I − A transition. A first order AC transition with elements of de Vries behavior can also occur. These results correspond well with experimental work to date.

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