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Перегляд Condensed Matter Physics, 1998, том 1 за датою випуску

Репозиторій DSpace/Manakin

Перегляд Condensed Matter Physics, 1998, том 1 за датою випуску

Сортувати за: Порядок: Результатів:

  • Constraints on possible mechanisms for high-Tc superconductivity 
    Schürrer, I.; Schachinger, E. (Condensed Matter Physics, 1998)
    This paper discusses a phenomenological model used to describe various properties of a dx²−y² superconductor in its temperature as well as frequency dependence, namely, the London penetration depth, the optical conductivity, ...
  • tJ -model in terms of equations with variational derivatives 
    Izyumov, Yu.A.; Chashchin, N.I. (Condensed Matter Physics, 1998)
    For a tJ -model in the X -operators representation a generating functional of the field describing fluctuations of matrix elements of electron hopping on a lattice is presented. The first order functional derivative with ...
  • 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.
  • 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 ...
  • Diagram technique for the Hubbard model. Ladder diagram summation 
    Moskalenko, V.A.; Kon, L.Z. (Condensed Matter Physics, 1998)
    A new diagram technique based on the generalized Wick theorem has been elaborated for the systems with strong electronic correlations. Coulomb repulsion of the electrons of the Hubbard model is considered as the main ...
  • 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 ...
  • Third-order relativistic dynamics: classical spinning particle travelling in a plane 
    Matsyuk, R. (Condensed Matter Physics, 1998)
    Mathisson’s ‘new mechanics’ of a relativistic spinning particle is shown to follow, in the case of planar motion, from only general requirements of relativistic invariance and of the dependence on third order derivatives ...
  • Isotropic forms of dynamics in the relativistic direct interaction theory 
    Duviryak, A.; Shpytko, V.; Tretyak, V. (Condensed Matter Physics, 1998)
    The Lagrangian relativistic direct interaction theory in the various forms of dynamics is formulated and its connections with the Fokker-type action theory and with the constrained Hamiltonian mechanics are established. The ...
  • 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. ...
  • Squared Weyl and Dirac fields with the Sommers-Sen connection associated with V³₄ distributions 
    Pelykh, V. (Condensed Matter Physics, 1998)
    Generalization of the Sommers–Sen spinor connection for spinor fields, associated with the distribution V³₄ is made and on its basis the equations for Weyl and Dirac null vector fields on complexificated V³₄ are ...
  • Gravitational spin-orbit interaction: criteria of increase 
    Plyatsko, R. (Condensed Matter Physics, 1998)
    The gravitational spin-orbit interaction in the region of the ultrarelativistic orbital velocity of a spinning test particle in the Schwarzschild field is investigated on the basis of the Mathisson-Papapetrou equations. ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Spin-fluctuation superconductivity in the Hubbard model 
    Plakida, N.M. (Condensed Matter Physics, 1998)
    The theory of the superconductivity mediated by kinematic and exchange interactions in t−J and two-band Hubbard models in a paramagnetic state is formulated. The Dyson equations for the matrix Green functions in terms of ...

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