Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 12, Pages 2526-2529Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.2526
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Doping of the ferroelectric Sm-C* phase with bent-shaped molecules induces the antiferroelectric Sm-C-A* phase. The effect was observed by means of electro-optic and dielectric measurements in systems with weak interlayer interactions in which the relative strength of anticlinic-synclinic order between molecules in adjacent layers is easily controlled by external factors. Fourier-transform infrared spectroscopy studies suggest that the bent-shaped molecules are not flat. They reorient upon the electric field-induced antiferroelectric-ferroelectric transition to adopt a position in which the average direction of the carbonyl groups is in the smectic plane and a bending tip along the C-2 symmetry axis.
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