Publication Title

Physical Review E

Publication Date

7-23-2012

Document Type

Article

DOI

10.1103/PhysRevE.86.011708

Keywords

isotropic-nematic transition, phase-transition, critical-point, smectic-a, temperature

Disciplines

Physics

Abstract

We report on homodyne dynamic light scattering measurements of orientational fluctuation modes in both calamitic and bent-core nematic liquid crystals, carried out in the new split-helix resistive magnet at the National High Magnetic Field Laboratory. The relaxation rate and inverse scattered intensity of director fluctuations exhibit a linear dependence on field-squared up to 25 tesla, which is consistent with strictly lowest order coupling of the tensor order parameter Q to field (Q(alpha beta)B(alpha)B(beta)) in the nematic free energy. However, we also observe evidence of field dependence of certain nematic material parameters, an effect which may be expected from the mean field scaling of these quantities with the magnitude of Q and the predicted variation of Q with field.

Comments

Copyright 2012 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevE.86.011708


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