Degeneracy lifting near the frustration points due to long-range interlayer interaction forces and the resulting varieties of polar chiral tilted smectic phases
Degeneracy lifting near the frustration points due to long-range interlayer interaction forces and the resulting varieties of polar chiral tilted smectic phases
复制标题
由于长程层间相互作用力以及由此产生的极性手性倾斜近晶相的变化，简并点附近的简并度升高
DOI：
10.1080/02678290902815434
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发表时间：
2009
期刊：
影响因子：
2.2
通讯作者：
A. Emelyanenko
中科院分区：
文献类型：
--
作者：
K. Sandhya;J. Vij;A. Fukuda;A. Emelyanenko
为了清楚地了解铁电性和反铁电性，以及它们在手性倾斜近晶液晶中的挫败感，我们在MHPOCBC和MHPOOCBC二元混合体系的原型中，通过绘制场致双折射轮廓，构建了E-T相图。根据Emelyanenko和Osipov提出的理论模型对所得结果进行了讨论；我们坚持用上层结构单元胞中铁电序和反铁电序的相对比来指定在温度诱导转变中依次出现的双轴亚相的适当性，例如，qT = [F]/([A] + [F])。除了具有三层和四层上层结构的普通子相之外，还有其他子相，并且已经确定存在，牢固地适用于和，但不太适用于和。同样地，我们观察到在场诱导下从双轴亚相到未缠绕SmC*的转变过程中，有几个稳定的上层结构，并试图用qE = |[R]−[L]|/([R] + [L])来指定它们，其中[R]和[L]分别指上层结构的单位胞中具有向右和向左倾斜的定向层的数量。我们还发现了单轴亚相的特征性场致变形，并试图根据最近由Torikai和Yamashita（41）报道的孤子凝聚引起的魔鬼阶梯来理解它。
To gain a clear understanding of ferroelectricity and antiferroelectricity together with their frustration in chiral tilted smectic liquid crystals, we have constructed E–T phase diagrams by drawing field-induced birefringence contours in the prototype binary mixture system of MHPOCBC and MHPOOCBC. The results obtained are discussed in terms of the theoretical model proposed by Emelyanenko and Osipov; we have insisted on the appropriateness of specifying the biaxial subphases, which emerge sequentially in the temperature-induced transition, by the relative ratio of ferroelectric and antiferroelectric orderings in the superstructure unit cell, such as , where qT = [F]/([A] + [F]). Additional subphases other than the ordinary subphases with three- and four-layer superstructures, and , have been established to exist, firmly for and less adequately for and . Likewise, we have observed several stable superstructures during the field-induced transition from the biaxial subphases to unwound SmC*, and have tried to specify them using qE = |[R] − [L]|/([R] + [L]), where [R] and [L] refer to the numbers of smectic layers with directors tilted to the right and to the left, respectively, in a unit cell of the superstructure. We have also found the characteristic field-induced deformation of the uniaxial subphase and attempted to understand it in terms of the devil's staircase due to soliton condensation reported recently by Torikai and Yamashita ( 41 ).