Title: Nonlinear dynamics of ferroelectrics with three-well local potential
Author(s):

	R. Yevych (Institute for Solid State Physics and Chemistry, Uzhgorod National University, 54 Voloshyn St., 88000 Uzhgorod, Ukraine) ,
	M. Medulych (Institute for Solid State Physics and Chemistry, Uzhgorod National University, 54 Voloshyn St., 88000 Uzhgorod, Ukraine) ,
	Yu. Vysochanskii (Institute for Solid State Physics and Chemistry, Uzhgorod National University, 54 Voloshyn St., 88000 Uzhgorod, Ukraine)

For Sn₂P₂S₆ ferroelectrics, the appearance of spontaneous polarization is related to stereoactivity of tin cations and valence fluctuations of phosphorous cations. Here, the continuous phase transition and its behavior under pressure is determined by thee-well local potential and can be described in an anharmonic quantum oscillator model. For such a model, the spectrum of pseudospin fluctuations at different temperatures and pressures has been calculated and compared with the data of Raman spectroscopy. It was revealed that the ferroelectric lattice instability is related to several low energy optic modes.

Key words: phase diagrams, ferroelectrics, lattice models in statistical physics
PACS: 05.50.+q, 05.70.Fh, 63.70.+h, 77.84.-s

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