Department of Theory of Complex System Dynamic Properties
Head of the Department: Yuri G.Pashkevich, doctor of physico-mathematical sciences, professor (062) 311-53-48
Directions of Scientific Researches: Dynamic and static properties of complex systems (metal oxides, small-sized magnetic and highly correlated systems, biopolymeters) in the external fields.
Basic Results
For the first time there were suggested a mechanism of a sub-threshold defect formation in the diamond-like crystals, and a new method of calculating electron and atomic structures of point defects [1] (V.A.Telezhkin, the State Prize of Ukraine in the field of science and engineering in 1995).
There was first considered an electro-dipole spin-induced single-phonon light absorption conditioned by magnetic ordering, and were studied new magneto-optical effects in anti-ferromagnetics [2] (Yu.G.Pashkevich, the State Prize of Ukraine in the field of science and engineering in 2003).
There was suggested a model of a universal primary physical mechanism of a mechano-chemical transformation of energy performed by protein molecular motors, the model being based on excited hydrogen bonds [3].
There were studied high-frequency properties of sharply anisotropic synthetic conductors with a profitably decreased dimensionality of the charge carrier motion including an ul-trasound attenuation, as well as spectral and relaxation characteristics of volume and surface plasma oscillations [4].
There was developed a method of a non-empirical calculation of electron density with the help of which there were considered physical properties of complex metal oxides [5].
There was developed a theory of a non-stationary electron transport in superconductor heterostructures regarding the effects of a quantum-mechanical phase malfunction [6].
There is studied an interrelation of structural, electron and magnetic properties of metal oxides [7].
Applied researches
Investigation of protium enrichment of a gaseous isotopic H-D-T-mixture at its filtration through a series of quasi-two-dimensional palladium membranes [8].
Scientific cooperation
The Institutes of the NAS of Ukraine: the Physico-technical Institute of Low temperatures of the NAS (Kharkov), the Institute of Physics of Metals of the NAS (Kiev); the Institute of Solid-State Physics and Semiconductors of the Academy of Sciences of Belorus (Minsk); the Physical Institute (Braunschweig, Germany), Max-Planck Institute (Stuttgart, Germany); University (Bratislava, Slovakia); Fridrich Schiller University (Yena, Germany).
In the context of the international cooperation the Department took and takes part in the fulfillment of the INTAS-grants and investigation CRDF and NATO-grants.
Selected publications
1. P.W.M.Jacobs, V.A.Telezhkin. Application of Green-function method to molecular systems. In book Modelling of Electronic and Atomic Processes in Solids, NATO ASI Ser.3/22. Kluwer Acad. Publ., 31 (1997).
2. Yu.G.Pashkevich, V.V.Pishko, V.V.Tsapenko, A.V.Eremenko. A magnetic ordering induced single-phonon infrared absorption in Nd2CuO4. ZhETF 109, 1433 (1996);; Yu.G.Pashkevich, V.A.Blinkin, V.P.Gnezdilov, V.V.Tsapenko, V.V.Eremenko, P.Lemmens, M.Fischer, M.Grove, G.Güntherodt, L.Degiorgi, P.Wachter, J.M.Tranquada, D.J.Buttrey Stripe conductivity in La1.775Sr0.225NiO4 Phys. Rev. Lett. 84, 3919 (2000).
3. S.V.Bespalova, K.B.Tolpygo. Biophysics 41, 22 (1996);S.V.Bespalova, K.B.Tolpygo. Biophysics 43, 484 (1998).
4. V.M.Gokhfeld. Electromagnetic surface waves in layered conductors. FNT 28, 304 (2002);V.M.Gokhfeld., V.G.Peschansky. On the electrodynamics of layered synthetic metals. Physica B 284-288, 1960 (2000).
5. V.A.Voloshin, A.A.Gusev, I.A.Danilenko, L.I.Medvedeva, A.D.Prokhorov, S.I.Khartsev. Interplay of structure, magnetism and resistivity of La0,5Ca0,54Mn3+x. Phys. Lett. A271, 121 (2000); A.A.Gusev, I.M.Reznik, V.A.Tsitrin. Electron-electron interaction and antishielding constants of core shells of atoms. J. Phys.: Condens. Matter 7, 4855 (1995).
6. í.á.Belogolovskii, M.Grajcar, P.Kúš, A.Plecenik, Š.Benacka, P.Seidel. Phase-coherent charge transport in superconducting heterocontacts. Phys. Rev. B 59, N 14, 9617 (1999); M.A.Belogolovskii Phase-breaking effects in superconducting heterostructures Phys. Rev. B 67, 100503(R) (2003), A.Abal’oshev, S.J.Lewandowski, A.I.D’yachenko, V.Yu.Tarenkov, M.A.Belogolovskii. Tunneling density of states of MgB2: evidence for a dominant π–band contribution. Physica Status Solidi (c) 2, 1633 (2005).
7. Yu.G.Pashkevich, V.A.Blinkin, V.P.Gnezdilov, V.V.Tsapenko, V.V.Eremenko, P.Lemmens, M.Fischer, M.Grove, G.Güntherodt, L.Degiorgi, P.Wachter, J.M.Tranquada, D.J.Buttrey Stripe conductivity in La1.775Sr0.225NiO4 Phys. Rev. Lett. 84, 3919 (2000); J. Pommer, V.Kataev, K.-Y.Choi, P.Lemmens, A.Ionescu, Yu.Pashkevich, A.Freimuth, G.Güntherodt, Interplay between structure and magnetism in the spin-chain compound (Cu,Zn)2V2O7 Phys. Rev. B 67, 214410 (2003); K.-Y.Choi, Yu.G.Pashkevich, K.V.Lamonova, H.Kageyama, Y.Ueda, P.Lemmens Strong anhar-monicity and spin-phonon coupling in the quasi-two-dimensional quantum spin system Sr1–xBaxCu2(BO3)2 Phys. Rev. B 68, 104418 (2003).
8. V.V.Rumyantsev, V.M.Shatalov, G.Ya.Misuna Gas separation of hydrogen isotopes by means of multicell metal membrane. Desalination 148, 293 (2002).
More:
Prof. V. M. Gohfeld
Dr. V. V. Rumyantsev
Dr. K. V. Lamonova
Dr. M. A. Belogolovskii
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