5 papers
Theory of Rochelle salt: beyond the Mitsui model
I. V. Stasyuk, O. V. Velychko
A simple four-sublattice order-disorder model is developed for description of phase transitions and dielectric properties of the Rochelle salt crystal. The model is developed as a…
Strong coupling approach in dynamical mean-field theory for strongly correlated electron systems
I. V. Stasyuk, A. M. Shvaika
We review two analytical approaches in Dynamical Mean-Field Theory (DMFT) based on a perturbation theory expansion over the electron hopping to and from the self consistent environ…
Thermodynamics and dielectric anomalies of DMAAS and DMAGaS crystals in the phase transitions region (Landau theory approach)
I. V. Stasyuk, O. V. Velychko, Z. Czapla +1
A simple description of thermodynamics of DMAAS and DMAGaS ferroelectric crystals by means of Landau expansion is proposed. Conditions of occurrence of phase transitions are establ…
Microscopic model of phase transition in the crystals of DMAAlS and DMAGaS type
I. V. Stasyuk, O. V. Velychko
The four-state model is proposed for description of phase transition in ferroelectric crystals of DMAGaS and DMAAlS type. Thermodynamical functions of the model are obtained in the…
Order-disorder model of phase transitions in the DMAGaS-DMAAlS family crystals
I. V. Stasyuk, O. V. Velychko
A four-state model is proposed for description of the sequence of phase transitions in ferroelectric crystals of DMAGaS and DMAAlS type. The ordering processes in the subsystems of…