Перегляд за автором "Stasyuk, I.V."

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Approximate analytical dynamical mean-ﬁeld approach to strongly correlated electron systems

Stasyuk, I.V. (Condensed Matter Physics, 2000)

An approximate analytical scheme of the dynamical mean-ﬁeld theory (DMFT), that is used for electron systems with Hubbard correlations and is exact in the limit of the inﬁnite dimensionality of a space, is developed. ...
Asymmetric Hubbard model within generating functional approach in dynamical mean field theory

Stasyuk, I.V.; Hera, O.B. (Condensed Matter Physics, 2006)

In the paper a new analytic approach to the solution of the effective single-site problem in the dynamical mean field theory is developed. The approach is based on the method of the Kadanoff-Baym generating functional ...
Bose-Einstein condensation and/or modulation of "displacements" in the two-state Bose-Hubbard model

Stasyuk, I.V.; Velychko, O.V. (Condensed Matter Physics, 2018)

Instabilities resulting in Bose-Einstein condensation and/or modulation of “displacements” in a system of quantum particles described by a two-state Bose-Hubbard model (with an allowance for the interaction between particle ...
Conﬁgurational splitting in Raman scattering spectra of crystals with the order-disorder type phase transitions

Stasyuk, I.V.; Ivankiv, Ya.L. (Condensed Matter Physics, 1999)

A system of equations for the averaged phonon Green function determining the shapes of the lines in Raman scattering spectra is obtained in the coherent potential approximation. Conﬁgurationally split components of ...
Density of states of one-dimensional Pauli ionic conductor

Stasyuk, I.V.; Dulepa, I.R. (Condensed Matter Physics, 2007)

Microscopic one-dimensional noninteracting model for the description of the energy spectrum of the ion subsystem in ionic conductor is considered. The processes of ionic hoppings are described in terms of Pauli operators. ...
Dielectric instabilities and phase transitions in pseudospin-electron model of HTSC system

Stasyuk, I.V. (Физика низких температур, 1996)

The possible dielectric instabilities and phase transitions in high-Tc superconductors are analyzed within the pseudospin-electron model involving Hubbard type electron correlations as well as their interaction with local ...
Dynamic conductivity of one-dimensional ion conductors. Impedance, Nyquist diagrams

Stasyuk, I.V.; Stetsiv, R.Ya. (Condensed Matter Physics, 2016)

Dynamic conductivity of the one-dimensional ion conductor is investigated at different values of the interaction constant between particles and the modulating field. The consideration is based on the hard-core boson ...
Dynamics of charge transfer along hydrogen bond

Stasyuk, I.V.; Stetsiv, R.Ya.; Sizonenko, Yu.V. (Condensed Matter Physics, 2002)

The pseudospin-electron model is formulated for the description of the correlated proton-electron charge transfer in the complex with hydrogen bonds. The energy spectrum of the model is obtained. The ground state diagram is ...
Energy spectrum and phase diagrams of two-sublattice hard-core boson model

Stasyuk, I.V.; Vorobyov, O. (Condensed Matter Physics, 2013)

The energy spectrum, spectral density and phase diagrams have been obtained for two-sublattice hard-core boson model in frames of random phase approximation approach. Reconstruction of boson spectrum at the change of ...
Gaussian fluctuations of polarization in the region of phase transitions in DMAGaS-DMAAlS ferroelectrics in the framework of the four-state model

Stasyuk, I.V.; Velychko, O.V. (Condensed Matter Physics, 2004)

A description of thermodynamics of the DMAGaS-DMAAlS family ferroelectrics improved by taking into account the Gaussian fluctuations of polarization is presented. Fluctuations become important in the vicinity of the second ...
Green’s functions of infinite-U asymmetric Hubbard model: Falicov-Kimball limit

Stasyuk, I.V.; Hera, O.B. (Condensed Matter Physics, 2003)

The asymmetric Hubbard model is used in investigating the lattice gas of the moving particles of two types. The model is considered within the dynamical mean-field method. The effective single-site problem is formulated in ...
Influence of electric fields on dielectric properties of GPI ferroelectric

Zachek, I.R.; Levitskii, R.R.; Vdovych, A.S.; Stasyuk, I.V. (Condensed Matter Physics, 2017)

Using modified microscopic model of GPI by taking into account the piezoelectric coupling with strains εi in the frames of two-particle cluster approximation, the components of polarization vector and static dielectric ...
Influence of σ₁ − σ₂ stress on phase transition and physical properties of KD₂PO₄-type ferroelectrics

Stasyuk, I.V.; Levitskii, R.R.; Zachek, I.R.; Duda, A.S. (Condensed Matter Physics, 2001)

Within the proposed earlier model we study effects of stress σ₁ − σ₂ on the KD₂PO₄ type ferroelectrics. In the cluster approximation for the short-range correlations, we calculate dielectric, piezoelectric, and elastic ...
Lattice Model of Intercalation

Mysakovych, T.S.; Krasnov, V.O.; Stasyuk, I.V. (2010)

The thermodynamics of a lattice model of intercalation of ions in crystals is considered in the mean-field approximation (MFA). The pseudospin formalism is used for the description of the interaction of electrons with ions, ...
Local anharmonic effects in high-Tc superconductors. Pseudospin-electron model

Stasyuk, I.V. (Condensed Matter Physics, 1999)

Some aspects of physical phenomena in high-Tc crystals caused by anharmonicity of the crystal lattice are discussed. Appropriate theoretical models are considered. A review is given of the results obtained while ...
Model description of the H–bonded transuranium complexes

Stasyuk, I.V.; Ivankiv, O.L.; Velychko, O.V.; Holubets, T.V. (Condensed Matter Physics, 1999)

In the framework of conﬁgurational model it is established that regions of existence of various forms of actinide hydroxocomplexes at variation of solution pH depend on differences of conﬁguration energies and ...
Models and phenomenology for conventional and high-temperature superconductivity

Stasyuk, I.V. (Condensed Matter Physics, 2001)

The book contains the proceedings of the International School of Physics “Enrico Fermi” (Course CXXXVI, Varenna on Lake Como, Italy, 24 June – 4 July 1997). The editors and the directors of the Course were ...
New type phase transitions in the Mitsui model with bimodal random ﬁeld

Stasyuk, I.V.; Velychko, O.V. (Condensed Matter Physics, 1999)

Thermodynamic functions of the Mitsui model with bimodal random ﬁeld are calculated in the mean ﬁeld approximation for long–range interactions with an exact treatment of the intracell interaction of pseudospins ...
Phase diagrams of the Bose-Fermi-Hubbard model: Hubbard operator approach

Stasyuk, I.V.; Mysakovych, T.S.; Krasnov, V.O. (Condensed Matter Physics, 2010)

The phase transitions in the Bose-Fermi-Hubbard model are investigated. The boson Green's function is calculated in the random phase approximation (RPA) and the formalism of the Hubbard operators is used. The regions of ...
Phase diagrams of the Bose-Hubbard model at finite temperature

Stasyuk, I.V.; Mysakovych, T.S. (Condensed Matter Physics, 2009)

The phase transitions in the Bose-Hubbard model are investigated. A single-particle Green's function is calculated in the random phase approximation and the formalism of the Hubbard operators is used. The regions of existence ...

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