2B05 反強誘電性液晶 MHPOCBC の非線型誘導スペクトロスコピ-I : SmC_α^*相における振幅モード

抄録

We have performed the nonlinear dielectric measurements in an antiferroelectric liquid crystal MHPOCBC and observed the amplitude mode in the high temperature region of SmC_α^* phase. A Landau-type theory was developed in order to analyze the experimentally obtained frequency dispersions in the third-order nonlinear dielectric response and it was found that the SmA-SmC^*_α phase transition is close to a tricritical point.