We report light-scattering measurements of nematic director fluctuations near the nematic-smectic-A-smectic-C multicritical point in the {}7S5-8OCB system. Our data analysis corrects for the effects of phase-boundary curvature and elucidates the evolution in the critical behavior as the nematic-smectic-A-smectic-C point is approached from both the N-SA and N-SC side of the multicritical point. The results agree closely with x-ray scattering data and the bend elastic-constant behavior differs from any current theoretical predictions.
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Solomon et al. (1986) studied this question.
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