Abstract

Dielectric measurements of a new antiferroelectric liquid crystal series exhibiting different phase sequences have been carried out as a function of frequency from 10 Hz to 10 MHz. Structural properties of S C α * and ferrielectric S C FI * phases were discussed on the basis of the experimental results of temperature and dc bias field dependencies of the dielectric modes. Besides the soft mode observed around the S A −S C α * phase transition, a Goldstone mode was detected in the S C α * phase indicating a helicoidal structure with small pitch values. In agreement with a bilayer ordering model, the dielectric absorption in the S C FI * phase was splitted up into two contributions: one related to a Goldstone mode and the other to an azimuthal antiphase mode.

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