Publication Title

Physical Review Letters

Publication Date

1-21-2002

Document Type

Article

DOI

10.1103/PhysRevLett.88.035701

Keywords

Resolution X Ray, Phase Transition, Liquid Crystals, Light Scattering, Orientational Order, Tricritical Point, Lattice Model, Superconductors, Fluctuations, Crossover

Disciplines

Physics

Abstract

The critical divergence of the smectic-order correlation lengths parallel and perpendicular to the director, ξ,, and the susceptibility, σ0, near the nematic-to-smectic-A phase transition has been measured in a 5 T magnetic field. The high magnetic field reduced the mosaicity and improved the effective transverse resolution by almost 2 orders of magnitude and permitted measurements nearly over four decades of reduced temperature. The results provide important new insights into mosaicity correction. The values of the critical exponents of ξ, and σ0 were ν = 0.79±0.02, ν = 0.68±0.02, γ = 1.45±0.04, respectively. They become smaller for a narrower nematic range.

Comments

Copyright 2002 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevB.88.035701.


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