Piezoelectric resonance in Rochelle salt A. Andrusyk
Institute for Condensed Matter Physics, 1 Svientsitsky Str., 79011 Lviv, Ukraine, E–mail: aaz@icmp.lviv.ua
A dynamic dielectric response of Rochelle salt is studied within the framework of the two-sublattice Mitsui model completed by piezoelectric interaction of the pseudospin system with the shear strainε4. Interaction with transverse field, attributed to ordering units flipping between two equilibrium positions, is taken into account. Special attention is given to the research of dynamic dielectric permittivity of free crystal. Developed approach explains the piezoelectric resonance phenomena and corrects some flaws of previous work [1]. It is shown, the equations describing piezoelectric resonance in the vicinity of transition point and the same equations distant from the transition point are different.
[1] A.P. Moina, R.R. Levitskii, and I.R. Zachek, Phys. Rev. B 71, 134108 (2005).
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