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Перегляд Condensed Matter Physics, 1998, № 1 за датою випуску

Репозиторій DSpace/Manakin

Перегляд Condensed Matter Physics, 1998, № 1 за датою випуску

Сортувати за: Порядок: Результатів:

  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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, ...
  • 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 ...
  • 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.
  • Honorary issues dedicated to the 60-th anniversary of Professor Ihor Stasyuk 
    Автор відсутній (Condensed Matter Physics, 1998)

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