Abstract
From light scattered by director modes in the smectic-$A$ phase of cyanobenzylidene octyloxyaniline (CBOOA) and octyloxy cyanobiphenyl (80CB) we deduce that the restoring force for phase fluctuations in the smectic order parameter vanishes as ${({T}_{c}\ensuremath{-}T)}^{0.33}$ as the nematic phase is approached. In CBOOA the force maintaining the molecules normal to the layers vanishes as ${({T}_{c}\ensuremath{-}T)}^{0.50}$. We conclude that de Gennes's analogy between charged superfluids and the smectic-$A$ phase is not entirely correct.
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