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- W2024359925 abstract "Ferroelectric behavior in the recently reported orthogonal ferroelectric Sm-${A}_{d}{P}_{F}$ phase in an unsymmetric bent-core molecule with a carbosilane terminal group was studied. The ferroelectricity of the Sm-${A}_{d}{P}_{F}$ phase was unambiguously confirmed by optical second-harmonic generation activity in the absence of an electric field, ferroelectric response, and high dielectric strength. The long-range polar order is a consequence of weakened interlayer coupling due to the formation of carbosilane sublayers, which allows for the parallel order of dipole moments of bent-core molecules in the neighboring layers. It develops in the system gradually through the second-order phase transition from the orthogonal Sm-${A}_{d}$ phase. In the Sm-${A}_{d}{P}_{F}$ phase the strong surface anchoring results in the splay of polarization across the sample thickness. The polar surface anchoring also brings about strongly thickness-dependent polar fluctuations, as proved by the dielectric measurements (Goldstone-like mode). The relaxation frequency and dielectric strength vary more than one order of magnitude with cell thickness; in particular the dielectric strength attains more than 2000 in a 25 $ensuremath{mu}$m-thick cell and continues to increase for thicker cells. Simple theory developed qualitatively explains the experimental results, supporting the polarization splay model proposed." @default.
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- W2024359925 date "2011-09-21" @default.
- W2024359925 modified "2023-10-17" @default.
- W2024359925 title "Ferroelectric behavior of orthogonal smectic phase made of bent-core molecules" @default.
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- W2024359925 doi "https://doi.org/10.1103/physreve.84.031706" @default.
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