Abstract
The phason dispersion in the antiferroelectric Sm- liquid crystalline phase of 4-(1-methylheptyloxycarbonyl)phenyl 4’-octyloxybiphenyl-4-carboxylate has been studied by quasielastic light-scattering experiments. The phason is found to be gapless as predicted for a Goldstone mode recovering the broken continuous symmetry. The dispersion has a minimum at q=2, where is the wave vector of the unperturbed Sm- structure. These results are consistent with the alternating-tilt model of the antiferroelectric Sm- phase.
- Received 21 June 1993
DOI:https://doi.org/10.1103/PhysRevLett.71.1180
©1993 American Physical Society