Sequence of Four Orthogonal Smectic Phases in an Achiral Bent-Core Liquid Crystal: Evidence for the SmAPα Phase

被引：35

作者：

Panarin, Y. P. ^{[1
,2
]}

Nagaraj, M. ^{[1
]}

Sreenilayam, S. ^{[2
]}

Vij, J. K. ^{[1
]}

Lehmann, A. ^{[3
]}

Tschierske, C. ^{[3
]}

机构：

[1] Univ Dublin Trinity Coll, Dept Elect & Elect Engn, Dublin 2, Ireland

[2] Dublin Inst Technol, Sch Elect & Commun Engn, Dublin, Ireland

[3] Univ Halle Wittenberg, Inst Chem, D-06120 Halle, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 24期

基金：

爱尔兰科学基金会;

关键词：

MOLECULES; ORDER;

D O I：

10.1103/PhysRevLett.107.247801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The mesomorphic properties of an achiral bent-core liquid crystal derived from 4-cyanoresorcinol are studied by polarizing optical microscopy, x-ray diffraction, and second harmonic electro-optic response. It shows a novel sequence of four nontilted or orthogonal smectic phases on cooling: SmA-SmAP(R)-SmAP(X)-SmAP(A). Here SmAP(X) is the new orthogonal polar uniaxial smectic phase. The electric-field-induced transformations in the SmAP(X) phase give rise to two biaxial states separated by a uniaxial one. The second harmonic electro-optic response in this phase is interpreted in terms of the polar interaction with the electric field. A comparison of the experimental results with the next-nearest-neighbor model for the structure of the SmAP(X) phase shows it to be an SmAP(alpha) phase.

引用

页数：5

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