Abstract
The unusual behavior of the low-frequency (10 Hz-1 MHz) permittivity in single crystals of ferroelectric multiferroic TbMnO3 has been experimentally and theoretically studied in detail in the region of the narrow temperature peak of the permittivity, associated with the ferroelectric phase transition (T (C) similar to 27.4 K). It has been found that the epsilon (c) (') (omega, T) maximum sharply decreases with increasing measured field frequency, while the temperature position of the maximum is independent of frequency. It has been shown that the observed features of the polarization response can be satisfactorily described within the Landau-Khalatnikov polarization relaxation theory.