Observation of a uniaxial ferroelectric smectic A phase

被引：44

作者：

Chen, Xi ^{[1
,2
]}

Martinez, Vikina ^{[1
,2
]}

Nacke, Pierre ^{[3
]}

Korblova, Eva ^{[4
]}

Manabe, Atsutaka ^{[5
]}

Klasen-Memmer, Melanie ^{[5
]}

Freychet, Guillaume ^{[6
]}

Zhernenkov, Mikhail ^{[6
]}

Glaser, Matthew A. ^{[1
,2
]}

Radzihovsky, Leo ^{[1
,2
]}

Maclennan, Joseph E. ^{[1
,2
]}

Walba, David M. ^{[4
]}

Bremer, Matthias ^{[5
]}

Giesselmann, Frank ^{[3
]}

Clark, Noel A. ^{[1
,2
]}

机构：

[1] Univ Colorado Boulder, Dept Phys, Boulder, CO 80309 USA

[2] Univ Colorado Boulder, Soft Mat Res Ctr, Boulder, CO 80309 USA

[3] Univ Stuttgart, Inst Phys Chem, D-70569 Stuttgart, Germany

[4] Univ Colorado Boulder, Dept Chem, Boulder, CO 80309 USA

[5] Merck KGaA, Elect Div, D-64293 Darmstadt, Germany

[6] Brookhaven Natl Lab, Natl Synchrotron Light Source II, Upton, NY 11973 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2022年 / 119卷 / 47期

关键词：

liquid crystal; ferroelectric; smectic; nematic; SPIN-GAS MODEL; LIQUID-CRYSTALS;

D O I：

10.1073/pnas.2210062119

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We report the observation of the smectic AF, a liquid crystal phase of the ferroelectric nematic realm. The smectic AF is a phase of small polar, rod-shaped molecules that form two-dimensional fluid layers spaced by approximately the mean molecular length. The phase is uniaxial, with the molecular director, the local average long-axis orientation, normal to the layer planes, and ferroelectric, with a spontaneous electric polarization parallel to the director. Polarization measurements indicate almost complete polar ordering of the similar to 10 Debye longitudinal molecular dipoles, and hysteretic polarization reversal with a coercive field similar to 2 x 10(5) V/m is observed. The SmA(F) phase appears upon cooling in two binary mixtures of partially fluorinated mesogens: 2N/DIO, exhibiting a nematic (N)-smectic Z(A) (SmZ(A))-ferroelectric nematic (N-F)-SmA(F) phase sequence, and 7N/DIO, exhibiting an N-SmZ(A)-SmAF phase sequence. The latter presents an opportunity to study a transition between two smectic phases having orthogonal systems of layers.

引用

页数：10

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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2021, 118 (22)

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