Within the framework of the Landau phenomenological model, the temperature and sample-thickness dependences of the heat capacity of thin uniaxial ferroelectric films near the second-order phase transition were studied. The heat capacity jump was found to decrease, diffuse, and shift to lower temperatures as the thickness of thin films decreased. At a certain thin-film thickness, the heat capacity anomaly disappeared (for instance, for triglycine sulfate, at a thickness of several nanometers).
Department of General Physics for Natural Science Faculties, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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