Started work at ILTPE in 1965. Has occupied the position of Professor of the Department of General and Experimental Physics of NTU ”Kharkivskiy Politechnical Institute” since 2002. Visiting Professor at Max Plank Institute (Dresden, Germany) in 1998 and at P.J. Shafarik University (Kosize, Slovak Republic) in the years 1991-2004 with a currently being implemented Agreement on cooperation with the last one. Participated in more than 50 international conferences and has published more 200 articles in Ukrainian and international journals on physics.

Research area: Lattice Dynamics, phonons and other quasi-particle excitations in solids:

• Propagation and localization of vibrations in infinite and semi-infinite crystals, surface waves, heat transfer between different media;
• Vibrational characteristics of real crystals;
• Dynamics of strongly anisotropic crystal structures, and quasi-low-dimensional lattices;
• Quasi-particle spectra and vibrational characteristics of nanoclusters and other nanosystems.

The main achievements:

• Dynamics of Highly Anisotropic (Quasi Low Dimensional) and Multi Layer Crystals
• The mechanism of Kapitsa thermal resistance was proposed.
• The condition of creation and characteristics of localized states connected with point impurities and continuous defects (twins, interfaces, adsorbed layers, etc.) were investigated and analyzed in detail.
• Shear waves localized near a mono-atomic layer adsorbed on the free surface of a strongly anisotropic layered crystal are studied at the microscopic level using a vector lattice model with translational and rotational invariance and elastic stability. It is shown that in some cases a non-central inter-atomic interaction results in the appearance of surface shear waves of a special type with one or two termination points and a damping parameter which is a non-monotonic function the two–dimensional wave vector.
• Multi-channel resonance transmission of phonons through the interface of the point contact was studied using the theory of capillary effects. We showed that anomalous peaks of the reduced heat flow at low temperatures are induced by the resonance transport of phonons through different layers of impurity atoms. Characteristics of channels of the phonon heat flow are calculated. The data obtained were in good agreement with the experimental results..

1. S.B.Feodosyev, I.A.Gospodarev, E.S.Syrkin, Anomalies of Linear Expansion Coefficient in Highly Anisotropic Crystals at Low Temperature, Phys, Stat. Sol (b), 150, K19, 1988.
2. T.G. Petrova and E.S. Syrkin, Surface spin waves in Heisenberg’s ferromagnets (review article), Low Temp. Phys. 17, No 4, 411, 1991.
3. S.B. Feodosyev, I.A. Gospodarev, A.M. Kosevich, E.S. Syrkin, Quasi-Low-Dimensional Effects in Vibrational Characteristics of 3D-Crystals, Phys. Low Dim. Str., 10/11, 209, 1995.
4. A.M. Kosevich, Yu.A. Kosevich, E.S. Syrkin, Vibrations Localized Near Surface and Interfaces in Nontraditional Crystals, (review) Progress in Surface Science, 55, N1, 1997.
5. Yu.A. Kosevich, E.S. Syrkin, Dissipative Interaction and Anomalous Surface Absorption of Bulk Phonons at Two-Dimensional Defects in a Solid, Phys. Letters A, 251, 1999.
6. I.A. Gospodarev, A.V. Grishaev, E.S. Syrkin, S.B. Feodosyev, Local Vibrations of FCC-Crystals with Two Parametric Substitution Impurities, Phys. Solid State, 42, N12, 2000.
7. A.M. Kosevich, A. Mayer, S.B. Feodosyev, I.A. Gospodarev, V.I. Grishaev, E.S. Syrkin, Atom Dynamics of Micro-Clusters on Atomically Smooth Surfaces, Superlattices and Microstructures, 27, No1, 7, 2000.
8. S.B.Feodosyev, M.A.Mamalui, E.S.Syrkin, Dynamical Characteristics of Infinite and Semi-Infinite 1D Structure with Defects in Presence of Activation, Synthetic Metals, 121, 1333, 2001.
9. E.T. Verkhovtseva, I.A. Gospodarev, V.I. Grishaev, S.I. Kovalenko, D.D. Solnyshkin, E.S. Syrkin, S.B. Feodosyev, Atom Dynamics and the Problem of the Structural Stability of Free Clusters of Solidified Inert Gases, Low Temperature Physics, 29, No 5, 386, 2003.
10. S.B.Feodosyev, I.A.Gospodarev, V.I.Grishaev, E.S.Syrkin, Vibrational dynamics and thermoynamical characteristics of the superlattices based on the metal-hydrogen system, Low Temperature Physics, 29, No 6, 530, 2003.
    1. Feher, A.A. Mamaluĭ, A. Ya. Dul’fan, E.S. Syrkin and A.G. Shkorbatov, Low-temperature phonon transport in 3D point-contacts (review), Low Temp. Phys. 31, No 11, 921, 2005.
11. I.A. Gospodarev, V.I. Grishaev, O.V. Kotlyar, K.V. Kravchenko, E.V. Manzhelii, E.S. Syrkin, and S.B. Feodosyev, Ioffe–Regel crossover and boson peaks in disordered solid solutions and similar peculiarities in heterogeneous crystal structures Low Temperature Physics, 34, No 8, 655, 2008.
12. E.S. Syrkin, S.B. Feodos’ev, K.V. Kravchenko, A.V. Eremenko, B.Ya. Kantor and Yu.A. Kosevich, Flexural rigidity of layers and its manifestation in the vibrational characteristics of strongly anisotropic layered crystals. Characteristic frequencies and stability conditions in quasi-two-dimensional systems, Low Temp. Phys. 35, No 2, 158, 2009.
13. I.A. Gospodarev, K.V. Kravchenko, E.S. Syrkin and S.B. Feodos’ev Quasi-two-dimensional features in the phonon spectrum of graphite Low Temp. Phys. 35, No 7 589, 2009.
14. A. Feher, I.A. Gospodarev, A.V.  Grishaev, K.V. Kravchenko, E.V. Manzheliĭ, E.S. Syrkin and S.B. Feodos’ev, Effect of defects on the quasiparticle spectra of graphite and graphene, Low Temp. Phys. 35, No 8, 679 2009
15. I.A. Gospodarev, V.V. Eremenko, K.V. Kravchenko, V.A. Sirenko, E.S. Syrkin and S.B. Feodos’ev Vibrational characteristics of niobium diselenide and graphite nanofilms Low Temp. Phys. 36, No 4, 344 2010.
16. Alexander Feher, Eugen Syrkin, Sergey Feodosyev, Igor Gospodarev and Kirill Kravchenko Quasi-Particle Spectra on Substrate and Embedded Graphene Monolayers, in: “Physics and Application of Graphene – Theo-ry” (ed. S. Mikhailov) “InTex” Open Access Publisher, ISBN 978-953-307-996-7 Croatia, 2010
17. A Feher, E. Syrkin, I. Gospodarev, E. Manzhelii, A. Kotlyar, K. Kravchenko, The Features of Low Frequency Atomic Vibrations and Propaga-tion of Acoustic Waves in Hete-rogeneous Systems, in: “Waves in Fluids and Solids” (ed. R.P. Vila) “InTex” Open Access Publisher, ISBN 978-953-307-246-3 Croatia, 2011.
18. I.A. Gospodarev, O.V. Kotlyar, K.V Kravchenko, E.V. Manzhelii, E.S Syrkin, A.V.Yeremenko, I.K. Galetich, Low Temperature Peculiarities of Quasi-Particle Spectra of Disordered Solid Solutions, in: “Contemporary Problems of Mathematics, Mechanics and Computer Sciences” (eds. N.N. Kizilova, G.N. Zholtkevich) PRB Virovec’,ISBN 978-966-2579-92-5 Ukraine, 2011
19. A.Feher, I.Gospodarev, O.Kotlyar, K.Kravchenko, E.Manzhelii, E.Syrkin, S.Feodosyev Impurity levels in the electron spectra of graphene, Superlattices and Microstructures, 53, 55, 2013
20. I.A. Gospodarev, A.V. Eremenko, K.V. Kravchenko, A.F. Sirenko, V.A. Sirenko, E. S. Syrkin, S.B. Feodosyev, *, and Yu. A. Shabakaeva, Distinctive Features of Thermal Expansion of Niobium Diselenide, Physics of the Solid State, 55 No. 4, 825, 2013