Abstract
The critical behavior of the smectic-A and nematic phase transition for the cyano group in 4- n-octyl-4′-cyanobiphenyl is reported for the first time by NMR measurements. The result suggests that the critical slowing down of the optical soft mode occurs clearly near the smectic-A and nematic phase transition temperature. The critical exponent for the coherence length ( ξ ) is estimated as 1 2 in both the smectic-A and nematic phases, which is consistent with the symmetry of the mean-field prediction at the smectic-A ↔ nematic phase transition. This critical exponent is found to be in good agreement with the value for the transverse coherence length obtained from X-ray scattering.
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