Grant J Strachan, Shona J Ramsay, Marijus Juodka, Damian Pociecha, Jadwiga Szydlowska, John M D Storey, Nataša Vaupotič, Rebecca Walker, Ewa Gorecka
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Interplay of Polar Order and Positional Order in Liquid Crystals-Observation of Re-entrant Ferroelectric Nematic Phase.
We show that development of polar order may spontaneously destroy the lamellar structure of a liquid crystal. This results in an unusual sequence of phases, with the ferroelectric nematic phase appearing below a non-polar smectic phase. The effect is related to unfavourable dipole interactions within the smectic layers and can be explained by Landau theory, in which the temperature-dependent term is non-monotonic as it is renormalised by spontaneous electric polarisation.
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