CUED Publications database

Ferroelectric-Ferroelastic Phase Transition in a Nematic Liquid Crystal.

Sebastián, N and Cmok, L and Mandle, RJ and de la Fuente, MR and Drevenšek Olenik, I and Čopič, M and Mertelj, A (2020) Ferroelectric-Ferroelastic Phase Transition in a Nematic Liquid Crystal. Phys Rev Lett, 124. 037801-.

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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-de Gennes type of macroscopic theory.

Item Type: Article
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 29 Jan 2021 21:40
Last Modified: 23 Feb 2021 01:47
DOI: 10.1103/PhysRevLett.124.037801