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The observation of a new critical point in liquid-crystal phase transitions is reported. Detailed tilt angle, polarization, and susceptibility measurements of a ferroelectric liquid crystal in the presence of an applied dc electric field show that a first-order transition between the polarized smectic-A phase and the ferroelectric smectic-C phase terminates at a critical point in the temperature-field plane.
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Bahr et al. (1989) studied this question.
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