Critical behavior of specific heat in a smectic-nematic phase transition in the liquid crystal octylcyanobiphenyl (8 CB)
Ostrovskii B. I., Sorkin E. L., Strukov B. A., Shlenskii A. L.
Precision measurements of the specific heat Cp of the liquid crystal 8 CB are performed. Combined analysis of the temperature dependence of Cp in the nematic phase in the smectic-^-nematic phase transition and nematic-isotropic liquid phase transition permitted separating these anomalies and determining the critical indices of the specific heat. It is shown that the region of the smectic-A-nematic phase transition studied experimentally is the region of the transition from tricritical to critical behavior.