Orientational order in the vicinity of a second order smectic-A to nematic phase transition

Measurements of the quadrupolar splitting of the central N 14 are reported for the liquid crystal NBOA. The splitting is a measure of the orientational order parameter. At the nematic to smectic- A transition, the orientational order parameter varies continuously as a function of temperature, but wi...

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Bibliographic Details
Published in:Solid state communications 1973-07, Vol.13 (2), p.129-132
Main Authors: Cabane, B., Clark, W.G.
Format: Article
Language:English
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Summary:Measurements of the quadrupolar splitting of the central N 14 are reported for the liquid crystal NBOA. The splitting is a measure of the orientational order parameter. At the nematic to smectic- A transition, the orientational order parameter varies continuously as a function of temperature, but with a discontinuous slope, as expected of a second order phase transition. The results are interpreted in terms of the Kobayashi-McMillan theory. On présente des mesures de la séparation quadrupolaire des niveaux du noyau N 14 central dans le cristal liquide NBOA. Cette séparation est une mesure du paramètre d'ordre orientationnel. A la transition smectique A-nématique le paramètre d'ordre orientationnel varie d'une manière continue en fonction de la température, mais sa pente est discontinue. Ces résultats sont intérpretés selon la theorie de Kiobayashi et McMillan.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(73)90209-3