Skip to main content
Article
Light Scattering from Liquid Crystal Director Fluctuations in Steady Magnetic Fields Up To 25 Tesla
Physical Review E
  • Pavan K. Challa
  • O. Curtiss
  • J. C. Williams
  • Robert J. Twieg
  • J. Toth
  • S. McGill
  • Jim T. Gleeson
  • Antal Jakli, Kent State University - Kent Campus
  • Samuel N. Sprunt
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
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

Citation Information
Pavan K. Challa, O. Curtiss, J. C. Williams, Robert J. Twieg, et al.. "Light Scattering from Liquid Crystal Director Fluctuations in Steady Magnetic Fields Up To 25 Tesla" Physical Review E Vol. 86 Iss. 1 (2012)
Available at: http://works.bepress.com/antal_jakli/60/