| Autor: |
Xi Chen, Martinez, Vikina, Nacke, Pierre, Korblova, Eva, Manabe, Atsutaka, Klasen-Memmer, Melanie, Freychet, Guillaume, Zhernenkov, Mikhail, Glaser, Matthew A., Radzihovsky, Leo, Maclennan, Joseph E., Walba, David M., Bremer, Matthias, Giesselmann, Frank, Clark, Noel A. |
| Předmět: |
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| Zdroj: |
Proceedings of the National Academy of Sciences of the United States of America; 11/22/2022, Vol. 119 Issue 47, p1-10, 21p |
| Abstrakt: |
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 ~10 Debye longitudinal molecular dipoles, and hysteretic polarization reversal with a coercive field ~2 × 105 V/m is observed. The SmAF phase appears upon cooling in two binary mixtures of partially fluorinated mesogens: 2N/DIO, exhibiting a nematic (N)–smectic ZA (SmZA)–ferroelectric nematic (NF)–SmAF phase sequence, and 7N/DIO, exhibiting an N–SmZA–SmAF phase sequence. The latter presents an opportunity to study a transition between two smectic phases having orthogonal systems of layers. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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