TEMPERATURE-DEPENDENCE OF FIELD HYSTERESIS LOOP IN NEMATO-CHOLESTERICMIXTURES

Temperature dependence of the field hysteresis loop (delta U) of the c holesterol-nematic phase transitions in mixtures based on strong and w eak polar nematics. The ephires of the cholesterol (0.2...1.6 weight % ) were used as optically active dopants. For mixtures, in which fluctu ation embryos have a major role at low temperatures, anomalous growth of delta U is observed. The influence of temperature dependence of con stants of elasticity and step of induced spiral on analogical dependen ce delta U = f(T) takes place. Magnitude of delta U can be changed by changing the percentage of cholesterine in the mixture.