NONLINEAR DIELECTRIC MEASUREMENTS IN THE SMECTIC-A-SMECTIC-C_α* PHASE TRANSITION

Abstract

We have performed precise measurements of the third-order dielectric constant in an antifer-roelectric crystal MHPOCBC. In the vicinity of the SmA- SmC_α* phase transition point an anomalous increase of it was observed. We have developed a Landau theory taking into account the pretransitional fluctuations and shown that the fluctuation can contribute to the third-order response. The anomalous behavior near the transition point was discussed on the basis of the theoretical results.

Key Words:

• fluctuation
• antiferroelectric liquid crystal
• nonlinear dielectric constant
• MHPOCBC