Galkin Donetsk Institute for Physics and Engineering

Donets’k, Ukraine

Galkin Donetsk Institute for Physics and Engineering

Donets’k, Ukraine
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Romero-Salazar C.,Benito Juárez Autonomous University of Oaxaca | Hernandez-Flores O.A.,Benito Juárez Autonomous University of Oaxaca | Chabanenko V.,Galkin Donetsk Institute for Physics and Engineering | Kuchuk E.I.,Galkin Donetsk Institute for Physics and Engineering | And 3 more authors.
Acta Physica Polonica A | Year: 2016

In this work we numerically modelled a periodic magnetic flux pattern which qualitatively reproduces the so-called sand avalanches scenario in type-II superconductors. To model these sand-pile patterns we consider a perturbation on the critical current which, as a first approximation, follows a periodic function which depends on the position. © 2016, Polish Academy of Sciences. All rights reserved.


Abramov V.S.,Galkin Donetsk Institute for Physics and Engineering
Bulletin of the Russian Academy of Sciences: Physics | Year: 2016

Stochastic deformation and stress fields within a fractal multilayer nanosystem are investigated theoretically and by numerical modeling. It is shown that the averaged displacement functions of lattice nodes are complex. Their behavior changes from regular to stochastic when the control parameters are altered. A set of ultracold 23Na atoms in an optical trap is chosen as the active nanoelement. It is demonstrated that certain physical properties (rate and quantization of the flow; hysteresis) of elementary excitations such as a vortex–antivortex pair are associated with the influence of a superfluid Bose–Einstein condensate (where a Higgs boson is the elementary excitation). © 2016, Allerton Press, Inc.


Okunev V.D.,Galkin Donetsk Institute for Physics and Engineering | D'yachenko T.A.,Galkin Donetsk Institute for Physics and Engineering | Burkhovetski V.V.,Galkin Donetsk Institute for Physics and Engineering
Physics of the Solid State | Year: 2017

The reflection R(ħω), transmission t(ħω), absorption, and refraction n(ħω) spectra of polycrystalline In2O3–SrO samples with low optical transparency, which contain In2O3 and In2SrO4 crystallites with In4SrO6 + δ interlayers, are examined. In the region of small ħω values, the reflection coefficient decreases as the resistance of samples saturated with oxygen increases. Spectral dependences n(ħω) and are calculated using the classical electrodynamics relations. The results are compared to the data based on the t(ħω) spectra. The calculated absorption spectra are interpreted within the model with an overlap of tails of the density of states in the valence band and in the conduction band. A “negative” gap Egn in the density of states with a width from–0.12 to–0.47 eV is formed in highly disordered samples in this model. It is demonstrated that the high density of defects and the band of deep acceptor states of strontium in the major matrix In2O3 phase are crucial to tailing of the absorption edge and its shift toward lower energies. The direct gap Egd = 1.3 eV corresponding to the In2SrO4 phase is determined. The energy band diagram and the contribution of tunneling, which reduces the threshold energy for interband optical transitions, are discussed. © 2017, Pleiades Publishing, Ltd.


Malashenko V.V.,Galkin Donetsk Institute for Physics and Engineering
Technical Physics | Year: 2017

The movement of an ensemble of edge dislocations under shock-wave action on an alloy that contains the Guinier–Preston zones has been theoretically studied. The analytical expression for the contribution of the Guinier–Preston zones into the dynamic yield stress has been obtained and it has been shown that this contribution is affected by the density of mobile dislocations. The numerical estimates have shown that the formation of these zones lead to a substantial increase in the dynamic yield stress of alloys. © 2017, Pleiades Publishing, Ltd.

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