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Critical Specific Heat Anomaly in Antiferroelectric Liquid Crystals-Crossover, and Multicritical Phenomena

Recent results of the heat capacity measurements carried out on liquid crystals which exhibit ferro-, ferri-, and antiferroelectric phases have been described. A high-resolution ultralow frequency ac calorimeter has been used for the measurement. The analyses of the data with a preasymptotic power-law equation which includes correction-to-scaling terms have revealed a non-Landau 3D-XY critical behavior which crosses over to a Gaussian tricritical behavior. Multicritical behavior observed in MHPOBC racemate has also been discussed.