Abstract
Anomalous dielectric behavior in biphenyl ester series of ferroelectric liquid crystals are reported. Even in the chiral smectic-C phase, the spontaneous polarization becomes zero at a certain temperature-Tm and increases again below Tm with decreasing temperature. Moreover, At Tm the reversal of the sign of tilt angle is observed, indicating the reversal of the sign of the spontaneous polarization. However, this anomaly is not observed in the measurement of the helicoidal pitch and is not influenced by the application of pressure below several kbar. The origin of this anomaly is also discussed in terms of molecular interactions and conformation.
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