THE HIGH-FREQUENCY DIELECTRIC RESPONSE OF A FERROELECTRIC LIQUID-CRYSTAL

The temperature and frequency dependences of the complex dielectric susceptibility of a ferroelectric liquid crystal near the smectic C*-smectic A phase transition have been calculated using the classical and generalized Landau models. It is shown that although the dielectric response of the S(C)* phase consists generally of four modes (soft, Goldstone, and two high frequency polarization modes) only three bands appear in the dielectric loss spectrum of ferroelectric liquid crystals at the S(A)-S(C)* phase transition. These results are in agreement with recent experimental data.