Abstract
Successive transitions in an AC electric field in cholesteric liquid crystals with negative dielectric anisotropy have been investigated systematically. According to the relations between the frequency of applied AC field and the threshold voltage V th of successive transitions and between V th and cell thickness divided by cholesteric pitch D / P 0 several features are observed. The threshold voltage for the dielectric regime extends to a DC electric regime. Quenching of the conduction regime is observed in a thinner sample cell. Some curious behaviors of the domain corresponding to the dielectric regime are also observed. A new model which can explain the mechanism of successive transitions in conduction regime is proposed.
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