Перегляд за автором "Velychko, O.V."

Результати 1-9 з 9

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 ...
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 ...
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 ...
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 separation in lithium intercalated anatase: A theory

Velychko, O.V.; Stasyuk, I.V. (Condensed Matter Physics, 2009)

Lithium intercalated anatase used in Li-ion batteries has some special features: coexistence of Li-rich and Lipoor phases as well as two possible positions for Li ions in the oxygen tetrahedron. A theoretical description of ...
Phonon-like excitations in the two-state Bose-Hubbard model

Stasyuk, I.V.; Velychko, O.V.; Vorobyov, O. (Condensed Matter Physics, 2015)

The spectrum of phonon-like collective excitations in the system of Bose-atoms in optical lattice (more generally, in the system of quantum particles described by the Bose-Hubbard model) is investigated. Such excitations ...
Thermodynamics and dielectric anomalies of DMAAS and DMAGaS crystals in the region of phase transitions (Landau theory approach)

Stasyuk, I.V.; Velychko, O.V.; Czapla, Z.; Czukwinski, R. (Condensed Matter Physics, 2000)

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 established and their temperatures are obtained. ...
The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensation

Stasyuk, I.V.; Velychko, O.V. (Condensed Matter Physics, 2012)

The Bose-Einstein condensation in the hard-core boson limit (HCB) of the Bose-Hubbard model with two local states and the particle hopping in the excited band only is investigated. For the purpose of considering the ...
Two-state Bose-Hubbard model in the hard-core boson limit

Stasyuk, I.V.; Velychko, O.V. (Condensed Matter Physics, 2011)

Phase transition into the phase with Bose-Einstein (BE) condensate in the two-band Bose-Hubbard model with the particle hopping in the excited band only is investigated. Instability connected with such a transition (which ...

Результати 1-9 з 9

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Перегляд за автором "Velychko, O.V."

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