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VOLUME 23 (1976) | ISSUE 9 | PAGE 506
Phonon spectrum in the vicinity of the phase transition from a crystal to a nematic liquid crystal, and the order parameter
The immediate vicinity of the crystal-nematic liquid crystal phase transition wa; investigated for the first time by using the long-wave IR absorption spectrum. From the temperature dependence of the integrated intensity of the 24 cm 1 phonon bend in the spectrum, we obtain for the order parameter at T< Tu a variation that agrees with the Landau theory.