DC-Bias-Field-Induced Dielectric Relaxation in Antiferroelectric Phase of TFMHPOBC

Dielectric properties in TFMHPOBC (4-(1,1,1-trifluoromethyl-heptyloxycarbonyl) phenyl 4'-octyloxybiphenyl-4-carboxylate) have been investigated as functions of temperature and dc bias field. In the antiferroelectric phase under no bias field, relaxation due to the soft mode and molecular rotation around the short axis are observed. Under dc bias field, a new relaxation is observed in chiral smectic C A (Sm C A * ). The dielectric strength of this relaxation depends on the bias field, while the relaxation frequency is not affected by the dc bias field.