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Перегляд Condensed Matter Physics за датою випуску

Репозиторій DSpace/Manakin

Перегляд Condensed Matter Physics за датою випуску

Сортувати за: Порядок: Результатів:

  • Impurity effective mass in superfluid ⁴He 
    Vakarchuk, I.O.; Babin, V.V. (Condensed Matter Physics, 1998)
    The system of bose liquid + impurity is considered. The energy spectrum, as well as effective mass of impurity is calculated. For the case of an ³He atom in superfluid <⁴He numerical calculations are performed.
  • Dielectric relaxation in dipolar fluids. Generalized mode approach 
    Omelyan, I.P.; Mryglod, I.M.; Tokarchuk, M.V. (Condensed Matter Physics, 1998)
    The concept of generalized collective modes, recently proposed for the investigation of simple fluids, is now applied to describe processes of dielectric relaxation in dipolar systems. The approach presented here is ...
  • Long-wave spin excitations of crystalline s − d models 
    Rudavsky, Yu.; Ponedilok, G.; Dorosh, L. (Condensed Matter Physics, 1998)
    Long-wave spin excitations in the perfect s-d model are studied. The Hamiltonian of the model includes, apart from usually treated spin-electron processes, the Heisenberg exchange interaction of atomic spins and the ...
  • Superconductivity in systems with local attractive interactions 
    Robaszkiewicz, S.; Micnas, R. (Condensed Matter Physics, 1998)
    We discuss approaches based on the concepts of local electron pairing and the superconducting properties which they imply. The nature of the intermediate coupling regime is addressed and a recent progress in the BCS–Bose ...
  • On temperature versus doping phase diagram of high critical temperature superconductors 
    Loktev, V.M.; Turkowski, V.M. (Condensed Matter Physics, 1998)
    An attempt to describe the bell-shape dependence of the critical temperature of high-T<sub>c</sub> superconductors on the charge carrier density is made. It is proposed to explain its linear increase in the region of ...
  • Symmetries in the physics of strongly correlated electronic systems 
    Mancini, F.; Avella, A. (Condensed Matter Physics, 1998)
    Strongly correlated electron systems require the development of new theoretical schemes in order to describe their unusual and unexpected properties. The usual perturbation schemes are inadequate and new concepts ...
  • Connecting the potential theory to the quantum field theory 
    Sazdjian, H. (Condensed Matter Physics, 1998)
    A constraint theory is applied to two-particle systems to construct Poincare´ invariant wave equations with interaction potentials. The latter can be determined in the quantum field theory from Feynman diagrams. ...
  • Analytical solution of the associative mean spherical approximation for the ion-dipole model 
    Holovko, M.F.; Kapko, V. (Condensed Matter Physics, 1998)
    A simple electrolyte in a polar solvent is modelled by a mixture of polar hard spheres and equal diameter charged hard spheres with the possibility of ionic dimerization. The analytical solution of the associative mean ...
  • The unified model description of order-disorder and displacive structural phase transitions 
    Stamenkovic, S. (Condensed Matter Physics, 1998)
    A series of co-authors’ studies [1-7] devoted to the unified model description of structural phase transitions (SPT) in ferroelectrics and related materials are reviewed and partly innovated. Starting from a general ...
  • The influence of hydrostatic pressure on DADP-type antiferroelectrics 
    Levitskii, R.R.; Moina, A.P. (Condensed Matter Physics, 1998)
    We study the effects of hydrostatic pressures on deuterated ND₄D₂PO₄ type antiferroelectric crystals. Within the four-particle cluster approximation the free energy of the crystals is calculated, and an equation for ...
  • Models of the adsorbtion-catalytic centers on transition metals 
    Litovchenko, V.G. (Condensed Matter Physics, 1998)
    The models of adsorbo-catalitic centers for transition metals, which use the peculiarities of the electron-orbital structures as insulated and bounded atoms, have been analized. The important role of the unfilled ...
  • Atomic static displacements and their effect on the short range order in alloys 
    Gurskii, Z.; Khokhlov, Yu. (Condensed Matter Physics, 1998)
    The influence of local atomic static displacements (ASD) on the short range order formation in binary alloys is investigated within the microscopic theory. Explicit expression for the binary correlation function Fourier ...
  • Analytic peculiarities of the polaron mass operator in the first two orders of the coupling constant 
    Tkach, M.; Voitsekhivska, O.; Val', O. (Condensed Matter Physics, 1998)
    The exact analytic expression for the polaron mass operator in the second order of the coupling constant is established for the first time. It holds in the whole energy scale. The peculiarities of the mass operator are ...
  • Resonance scattering of a transverse sound wave from a planar crystal defect 
    Kosevich, A.; Semagin, D. (Condensed Matter Physics, 1998)
    Resonance scattering of a monochromatic transverse acoustic wave of the Rayleigh polarization from an isotop defect layer is considered. The phase velocity c of the incident wave along the defect plane is assumed to ...
  • Parametric crystal optics of nonmagnetic ferroics 
    Vlokh, O.G. (Condensed Matter Physics, 1998)
    Proceeding from the symmetry principles of crystal physics and thermodynamics we analyze parametrical optical phenomena induced by external fields of different kind and structural phase transitions in ferroelectrics ...
  • Ferroelastic domain wall orientations in the (NH₄)₃H(SeO₄)₂ crystal 
    Pavlenko, N.; Połomska, M.; Hilczer, B. (Condensed Matter Physics, 1998)
    Experimental and theoretical studies of the ferroelastic domain structure of the (NH₄)₃H(SeO₄)₂ crystal in phases III and IV are performed. Using the refined structural data the orientations of W - and W′-type domain ...
  • Coherent tunnel repolarization of a hydrogen bonded chain 
    Tomchuk, P.M.; Luk’yanets, S.P. (Condensed Matter Physics, 1998)
    In the present paper we suggest a possible mechanism of repolarization of a short hydrogen bonded chain. This mechanism is based on the coherent tunnel reorientation of ionic groups and is additional to the other one ...
  • Ab initio water hexamers and octamers: tool to study hydrogen-bonded pattern in liquid water 
    Kryachko, E. (Condensed Matter Physics, 1998)
    Fourteen different structures of water hexamer found ab initio within a 6- 311G** basis set in the interval of 1.7 kcal/mol above the global minimum represent an unprecedently wide range of conformational plasticity of ...
  • Nonlinear phenomena in screening of highly charged grains in plasmas 
    Bystrenko, O.; Zagorodny, A. (Condensed Matter Physics, 1998)
    Nonlinear effects in screening a high-Z grain immersed in a plasma background were investigated by means of microscopic Monte-Carlo simulations and within the Poisson-Boltzmann theory. A distinct difference from the ...
  • A modified form of the polar model of crystals 
    Didukh, L. (Condensed Matter Physics, 1998)
    A model for the description of materials with narrow energy bands is proposed. It is shown that in narrow-band materials an electron-hole symmetry is absent in contrast to the Hubbard model. In this paper a metal-insul ...

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