Title: Dynamics of the Rochelle salt NaKC₄H₄O₆·4H₂O crystal studied within the Mitsui model extended by piezoelectric interaction and transverse field
Author(s):

	R.R. Levitskii (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitsky Str., 79011 Lviv, Ukraine) ,
	A.Ya. Andrusyk (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitsky Str., 79011 Lviv, Ukraine) ,
	I.R. Zachek (Lviv Polytechnic National University, 12 Bandera Str., 79013 Lviv, Ukraine)

We calculated dynamic dielectric permittivity of the Rochelle salt within the Mitsui model, extended by piezoelectric interaction and transverse field. Calculations were based on the parameters derived earlier within the study of thermodynamic properties of Rochelle salt. The study of dynamic properties was performed within the Bloch equation method. We showed that taking transverse field into account allows for better description of the Rochelle salt relaxation dynamics. Furthermore, we showed that taking transverse field into account results in the appearance of a resonant component in dynamic permittivity like it is observed in experiment. However, in accordance with the calculations, resonant response reveals itself within infrared frequency range, whereas in experiment it is observed within submillimeter spectral region.

Key words: Rochelle salt, molecular field approximation, dynamic dielectric permittivity, relaxation dynamics, resonant dynamics
PACS: 77.22.Ch, 77.80.Bh, 77.84.Fa

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