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The main areas of scientific activity and theoretical investigations are:
thermodynamics and kinetics of quantum crystals, He-He solid solutions, atomic
and molecular cryocrystals (among them two-dimensional cryocrystalline systems
on substrate) as well as quantum magnet systems. Current topics of research
interests are also theory of crystal lattice defects as well as acoustic and
electromagnetic emission during plastic deformation of imperfect crystals.
Quantum Crystals
Thermodynamics of solid helium mixtures. A consistent theory was developed
for description of the temperature dependences of separating helium solid
solutions heat capacity at arbitrary concentrations both below and above . It
was shown that at the temperature behavior of the heat capacity is completely
defined by correlation effects in the impurity subsystem.
Kinetics of cryocrystals. The evolution of the heterophase structure of a
dilute solid solution He in He was studied theoretically. Relaxation processes
in solid He–He solutions was shown to be controlled by the mobility of the phase
boundaries, whose velocity is determined by the quantum diffusion parameters for
impurity He in the matrix of He.
The quantum mechanical problem of inelastic phonon scattering on a quadrupole
defect (ortho-H pair complex in the parahydrogen matrix) was solved. The
contribution of this mechanism to the low-temperature thermal conductivity was
discussed.
Thermodynamics of cryocrystals with molecular imporities. A rigorous analytic
theory was developed to describe temperature and concentration dependences of
the excess impurity heat capacity of dilute solid solutions of diatomic
molecules in a rare gas matrix. The theory is in excellent agreement with the
experiment in the wide range of temperatures and concentrations.
Magnetism of 2D He monolayers. Within the Heisenberg model the theoretical
approach was developed to describe thermodynamic and magnetic properties of the
second He layer solid on graphite. It was proved the pure Heisenberg behavior of
2D solid He in the ferromagnetic regime. The proposed theory is in excellent
agreement with the experimental data for all the temperatures.
Dynamics and thermodynamics of two-dimensional cryocrystals. Low-temperature
dynamics and thermodynamics of two-dimensional monoatomic crystals with
triangular lattice was investigated theoretically. The phonon spectra and
low-temperature heat capacity were calculated analytically for monolayer
structures both commensurate and incommensurate with the substrate. The obtained
theoretical results provide an explanation for a great variety of experimental
data on the spectra of lattice excitations and thermal properties of rare gas
and helium monolayers on graphite and metal substrates.
The dynamical interaction of translational and rotational degrees of freedom
of a diatomic homonuclear substitutional impurity placed in 2D close-packed
atomic matrix on a substrate is investigated theoretically. It is shown that the
translational-rotational interaction drastically changes inertial properties of
the impurity as compared to a free rotator. Namely, this interaction leads to a
strong modification of the kinetic energy operator as well as to renormalization
of the crystal field parameters. Such effects can be manifested in the
rotational spectrum and the impurity heat capacity of the system at low
temperatures.
Acoustic and electromagnetic emission during plastic deformation
Acoustic (AE) and electromagnetic (EME) emissions during plastic deformation
of solids. Sound irradiation from dynamic dislocations and dislocation ensembles.
Localized states of electrons on dislocations in metals. Mechanism of
electromagnetic emission from plastically deformed ionic crystals. Correlation
between AE and EME in deformed ionic crystals. Effect of gamma-irradiation on AE
and EME in ionic crystals.
Total number of publications – over 120.
Selected publications:
[ 1] V.D.Natsik, K.A.Chishko. Sound radiation during annihilation of
dislocations. Fizika Tverdogo Tela , 14 , No. 12, 3126-3132 (1972).
[ 2] V.D.Natsik, K.A.Chishko. Emission of sound from dislocations moving near
the surface of a crystal. Fizika Tverdogo Tela , 20 , No. 2, 457-465 (1978);
Soviet Physics: Solid State , 20 , 264-269 (1978).
[ 3] K.A.Chishko. Effect of a dislocation boundary on the internal stress
distribution in a crystal. Fizika Tverdogo Tela , 23 , 36-45 (1981); Soviet
Physics: Solid State , 23 , 20-25 (1981).
[ 4] K.A.Chishko. Interaction of a
rectilinear dislocations with a low-angle dislocation boundary. Fizika Tverdogo
Tela , 23 , 3028-3022 (1981); Soviet Physics: Solid State , 23 , 1776-1768
(1981).
[ 5] V.D.Natsik, K.A.Chishko. Acoustic emission of dislocations emerging the
crystal surface. Akusticheskii Zhurnal , 26 , No. 2, 421-429 (1982).
[ 6] V.A.Slyusarev, K.A.Chishko. Electron localized states on edge dislocation
in metal. Fizika Metallov i Metallovedenie , 58 , No. 5, 877-883 (1984).
[ 7] K.A.Chishko. Transient acoustic waves due to a screw dislocation which
reaches the surface of an isotropic plate. Fizika Tverdogo Tela , 31 , No. 1,
223-229 (1989); Soviet Physics: Solid State , 31 , 122-125 (1989).
[ 8] K.A.Chishko. Emission of sound due to formation of a crack in an infinite
elastic medium and at the surface of an elastic semi-infinite medium. Fizika
Tverdogo Tela , 31 , No. 3, 226-233 (1989); Soviet Physics: Solid State , 31 ,
476-480 (1989).
[ 9] K.A.Chishko. Plasticity and brittleness of cryocrystals of rare gases.
Fizika Tverdogo Tela , 31 , N 6, 283-286 (1989); Soviet Physics: Solid State ,
31 , 1077-1079 (1989).
[ 10] K.A.Chishko. Sound radiation caused by interaction between low-angle
dislocation boundary and point obstacle. Akusticheskii Zhurnal , 35 , No. 3,
533-540 (1989).
[ 11] K.A.Chishko. Dynamical Green tensor and elastic fields of moving
dislocation loops in isotropic plate. Akusticheskii Zhurnal , 35 , No. 3,
527-532 (1989).
[ 12] K.A.Chishko. About the spectrum of Rayleigh-Lamb waves in an isotropic
elastic plate. Akusticheskii Zhurnal , 36 , No. 1, 153-159 (1990).
[ 13] K.A.Chishko. Sound radiation during extension of a circular crack in an
isotropic elastic medium. Akusticheskii Zhurnal , 36 , No. 3, 541-547 (1990).
[ 14] K.A.Chishko. Emission of normal shear waves by rectilinear dislocations on
an isotropic plate. Fizika Tverdogo Tela , 33 , 3051-3053 (1991); Soviet Physics:
Solid State , 35 , 1722-1723 (1991).
[ 15] K.A.Chishko. Dislocation mechanism of the emission of sound during growth
of a crack in a crystal. Fizika Tverdogo Tela , 34 , 864-869 (1992); Soviet
Physics: Solid State , 34 , 462-465 (1992).
[ 16] K.A.Chishko. Emission of Rayleigh waves on emergence of an edge
dislocation on the surface of a plate, Fizika Tverdogo Tela , 34 , 2236-2243
(1992); Soviet Physics: Solid State , 35 , 1195-1199 (1992).
[ 17] V.D.Natsik, K.A.Chishko. Formulation of basic problem of acoustic emission
theory for solids with dispersion and attenuation. Akusticheskii Zhurnal , 38 ,
No. 3, 511-519 (1992).
[ 18] K.A.Chishko. Emission of Rayleigh waves by a system of internal stresses
sources in an isotropic elastic layer. Ukrainskii Fizicheskii Zhurnal , 37 , No.
5, 745-753 (1992).
[ 19] T.N. Antsygina, K.A.Chishko. Angular distribution of sound emitted by thin
cracks. Fizika Tverdogo Tela , 35 , 1797-1801 (1993); Physics of Solid State ,
35 , 898-900 (1993).
[ 20] K.A.Chishko. Acoustic emission by a screw dislocation emerging at an
internal boundary in a crystal. Fizika Tverdogo Tela , 35 , 2901-2907 (1993);
Physics of Solid State , 35 , 1423-1425 (1993).
[ 21] K.A.Chishko. Emission of Lamb waves by system of internal stress sources
in an isotropic elastic layer. Akusticheskii Zhurnal , 39 , No. 1, 159-166
(1993).
[ 22] K.A.Chishko. Acoustic emission images of cracks in solids. In: Acoustical
Imaging , Vol.21, Ed.by J.P.Jones, Plenum Press,1995, pp.649-660.
[ 23] K.A.Chishko, O.V.Charkina. Emission of electromagnetic waves by edge
dislocations moving in ionic crystals. Fizika Tverdogo Tela , 38 , 2775-2786
(1996); Physics of Solid State , 38 , 1521-1526 (1996).
[ 24] K.A.Chishko, O.V.Charkina. Radiation of electromagnetic waves from edge
dislocations moving in ionic crystals. Materials Sciences & Engineering ,
A234-236 , 361-364 (1997);
[ 25] T.N. Antsygina, V.A.Slusarev, K.A.Chishko. Heat capacity of solid
solutions of He in He . Low Temp. Phys. , 21 , 453-457 (1995).
[26] T.N. Antsygina, V.A.Slusarev, K.A.Chishko. Decomposition kinetics of solid
solution of
helium isotopes. Physics of Solid State , 38 , 1054-1062 (1996).
[27] T.N.Antsygina, K.A.Chishko, V.A.Slusarev. Heat capacity of dilute solid
solutions of
diatomic molecules in the matrix of inert gases. Phys.Rev. B 55 , 3548-3558
(1997).
[28] T.N.Antsygina, V.A.Slusarev, K.A.Chishko. Characteristic behavior of the
specific heat of
exolving He-He solid solutions. Physics of Solid State , 40 , No.2, 355-361
(1998).
[29] T.N.Antsygina, V.A.Slusarev, K.A.Chishko. Inelastic scattering of phonons
by quadrupole
defects with internal degrees of freedom. Journ. Exp. and Theor. Phys. , 87 ,
303 (1998).
[30] T.N.Antsygina, K.A.Chishko. Thermodynamics of He solid monolayers in the
Heisenberg
model. Physics of Solid State , 42 , No.1, 100-108 (2000).
[31] T.N.Antsygina, K.A.Chishko. Heat capacity and susceptibility of
two-dimensional He solid
within the Heisenberg model. Journ. Low Temp. Phys ., 119 , No. 5/6, 677-690
(2000).
[32] M.I.Poltavskaya and K.A.Chishko. Thermodynamics of an atomic monolayer with
diatomic
substitutional impurities. Low Temperature Physics , 26 , No. 4, p.289-295,
2000.
[33] M.I.Poltavskaya and K.A.Chishko. Spectrum of rotational states of a
diatomic impurity in an
atomic 2D cryocrystal. Low Temperature Physics , 26 , N 8, p.615-621, 2000.
[34] T.N.Antsygina, K.A.Chishko, V.A.Slusarev. Correlation effects in the heat
capacity of separating He-He solid solutions. Journ. Exp. and Theor. Phys ., 119
, No.1, 107-114 (2001).
[35] T.N.Antsygina, M.I.Poltavskaya, and K.A.Chishko. Interaction of
translational and rotational
modes of a molecular impurity in two-dimensional atomic crystals. Physics of
Solid State , 44 ,
No.7, 1268-1277 (2002).
[36] T.N.Antsygina, I.I.Poltavsky, M.I.Poltavskaya, and K.A.Chishko. Lattice
dynamics and heat
capacity of a two-dimensional monoatomic crystal on a substrate. Low Temperature
Physics ,
28 , No.6, 442-451 (2002).
[37] T.N.Antsygina, M.I.Poltavskaya, and K.A.Chishko. Translational-rotational
interaction in
dynamics and thermodynamics of 2D atomic crystal with molecular impurity.
Low Temperature Physics , 29 , No.9/10, 961-966 (2003).
[38] T.N. Antsygina, I.I.Poltavsky, and K.A.Chishko. Thermodynamics of
low-dimensional
adsorption in grooves, on the outer surface, and in interstitials of a
close-ended carbone
nanotube bundle, Phys. Rev. B 74 , N 20, 205429(10) (2006).
[39] T.N. Antsygina, V.N.Grigor'ev, V.A.Maidanov, S.P.Rubets, E.Ya. Rudavskii,
A.S.Rybalko,
E.V.Syrnikov, and A.A.Penzev, Fluctuation effects at pre-separation region in
solid 3 He- 4 He
mixtures, J. Low Temp. Phys ., 148 , N5/6, 719-724 (2007).
[40] T.N. Antsygina, I.I.Poltavsky, and K.A.Chishko, Exactly solved model for 4
He adsorption on
carbon nanotube bundles: Quantitative thermodynamic description, J. Low Temp.
Phys ., 148 ,
N5/6, 821-826 (2007).
[41] V.Hadjicontis, C.Mavromatou, T.N. Antsygina, and K.A.Chishko, Mechanism of
electromagnetic emission in plastically deformed ionic crystal, Phys. Rev. B 76
, N 2,
024106(15) (2007).
[42] T.N. Antsygina, M.I.Poltavskaya, I.I.Poltavsky, and K.A.Chishko.
Thermodynamics of low-
dimensional spin-1/2 Heisenberg ferromagnets in magnetic field within Green
function
formalism, Phys. Rev. B 77 , N 2, P. 024407(10) (2008).
[43] T.N. Antsygina, M.I.Poltavskaya, I.I.Poltavsky, and K.A.Chishko, Square
lattice hard-core
bosons within the random phase approximation, Phys. Rev. B 80 , N 17, P.
174511(9) (2009).
[44] T.N. Antsygina, M.I.Poltavskaya, I.I.Poltavsky, and K.A.Chishko. Excitation
spectra of hard-
core bosons on square and triangular lattices in the superfluid phase, Phys. Rev.
B 82 , N 10,
144504(10) (2010).
[45] T.N. Antsygina, A.A. Lisunov, V.A. Maidanov, V.Y. Rubanskyi, S.P.Rubets,
E.Ya.
Rudavskii, and K.A.Chishko, Homogeneous 3 He- 4 He solid solutions in the
pre-separation
region, Physica B: Condensed Matter 406 , 3870-3875 (2011).
[46] V.Hadjicontis, C.Mavromatou, D. Mastrogiannis, T.N. Antsygina, and
K.A.Chishko,
Relationship between electromagnetic and acoustic emissions during plastic
deformation of
gamma-irradiated LiF monocrystals, J. Appl. Phys . 110 , N 2, 024907(9) (2011).
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