论文标题
在非极性至极性列表过渡上方以上的临界pl骨波动和巨大的柔性效应
Critical splay fluctuations and colossal flexoelectric effect above non-polar to polar nematic phase transition
论文作者
论文摘要
最近发现具有极阶的列液晶（铁电列）引起了极大的兴趣。尽管进行了深入的研究，但该液晶的几种物理特性尚待研究和理解。在这里，我们报告了关于极性列（NF）液晶的双向反射和外部系数的实验研究。我们的实验直接表明，散布波动会影响非极（N）上方几个度的双向反射，并从倾斜角波动中获得的极性（NF）相变温度以及从倾斜角度波动获得的热容量指数接近于在绝热扫描量热计测量中报告的值。非极性列相的挠性系数显示了幂律对温度的依赖性。我们的结果表明，电动极化与电动极化的强烈耦合，从而降低了弹性弹性常数，从而增强了柔性系数。这些结果对于即将到来的应用以及了解铁电列液晶中的所有前经过预处理效应都很重要。
The recent discovery of nematic liquid crystals with polar order (ferroelectric nematic) has created immense interest. Despite intensive research, several physical properties of this liquid crystal are yet to be investigated and understood. Here, we report experimental studies on the birefringence and exoelectric coefficient of a polar nematic (NF) liquid crystal. Our experiments directly reveal that the splay fluctuations influence the birefringence several degrees above the nonpolar (N) to polar-nematic (NF) phase transition temperature and the heat capacity exponent obtained from the tilt angle fluctuations is close to the value reported in adiabatic scanning calorimetry measurements. The flexoelectric coefficient of the nonpolar nematic phase shows a power-law dependence on temperature. Our results demonstrate a strong coupling of splay fluctuations with electric polarization that reduces the splay elastic constant and consequently enhances the flexoelectric coefficient. These results are important for forthcoming applications as well as for understanding all pretransitional effects in ferroelectric nematic liquid crystals.
