2C04 液晶におけるThresholdless Antiferroelectricityと新規相SmC_R^*存在の可能性

概要

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We have investigated a field induced phase transition between SmC^* and SmC_A^* in a three-component mixture of ferroelectric and antiferroelectric liquid crystals characterized by trifluoro-alkoxyalkyl carboxylate and partially fluoro-substituted phenyl rings. We encountered a system where a pretransitional effect is enhanced and a threshold becomes zero so that the field induced F-AF-F phase transition looks like a V-shape switching. In this phase, it is possible that molecular tilting direction is non-correlated between adjacent layers; tilting randomization among smectic layers assures the disappearance of net spontaneous polarization, but an applied electric field induces it according to the Langevin-type equation. We propose to designate the phase with thresholdless antiferroelectricity as SmC_R^* with subscript R meaning random.
日本液晶学会の論文
1995-09-10