Ferroelectric-Ferroelastic Phase Transition in a Nematic Liquid Crystal
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- 20 January 2020
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 124 (3), 037801
- https://doi.org/10.1103/PhysRevLett.124.037801
Abstract
Ferroelectric ordering in liquids is a fundamental question of physics. Here, we show that ferroelectric ordering of the molecules causes the formation of recently reported splay nematic liquid-crystalline phase. As shown by dielectric spectroscopy, the transition between the uniaxial and the splay nematic phase has the characteristics of a ferroelectric phase transition, which drives an orientational ferroelastic transition via flexoelectric coupling. The polarity of the splay phase was proven by second harmonic generation imaging, which additionally allowed for determination of the splay modulation period to be of the order of 5-10 microns, also confirmed by polarized optical microscopy. The observations can be quantitatively described by a Landau-dc Gennes type of macroscopic theory.Keywords
Funding Information
- Javna Agencija za Raziskovalno Dejavnost RS (P1-0192)
- European Regional Development Fund
- Euskal Herriko Unibertsitatea (GIU18/146)
- Engineering and Physical Sciences Research Council
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