Перегляд за автором "Folk, R."

Сортувати за: Порядок: Результатів:

  • Correlations, connections, and physics in complex systems 
    Berche, B.; Folk, R.; Kenna, R.; Mryglod, O. (Condensed Matter Physics, 2017)
    It is with great pleasure that we present, in this issue, a series of papers dedicated to the 60th birthday of Professor Yurij Holovatch. The broad spectrum of topics treated by the contributions reflect Yurij’s comprehensive ...
  • Critical slowing down in random anisotropy magnets 
    Dudka, M.; Folk, R.; Holovatch, Yu.; Moser, G. (Condensed Matter Physics, 2005)
    We study the purely relaxational critical dynamics with non-conserved order parameter (model A critical dynamics) for three-dimensional magnets with disorder in a form of the random anisotropy axis. For the random ...
  • Critical sound in fluids and mixtures 
    Folk, R.; Moser, G. (Condensed Matter Physics, 1999)
    The behaviour of sound is explained within the dynamical renormalization group theory. Non-asymptotic effects are due to the deviation of renormalized couplings from their fixed point values. We calculate the temperature and ...
  • Critical transport and critical scattering in fluids 
    Folk, R. (Condensed Matter Physics, 2000)
    We consider the critical properties of fluids induced by the critical fluctuations in the order parameter. The theory describes the crossover from the analytic background behaviour to the universal asymptotic behaviour of ...
  • Dynamic structure factors of a Heisenberg model ferrofluid 
    Mryglod, I.; Folk, R.; Dubyk, S.; Rudavskii, Yu. (Condensed Matter Physics, 1999)
    Using the results of our previous papers [Physica A 220 (1995) 325; Physica A 234 (1996) 129], where the generalized transport equations for a Heisenberg-like model of a ferrofluid were derived and the hydrodynamic collective ...
  • Gauge dependence of the critical dynamics at the superconducting phase transition 
    Dudka, M.; Folk, R.; Moser, G. (Condensed Matter Physics, 2007)
    The critical dynamics of superconductors in the charged regime is reconsidered within field-theory. For the dynamics, the Ginzburg-Landau model with complex order parameter coupled to the gauge field suggested earlier ...
  • Ground states of anisotropic antiferromagnets with single ion and cubic anisotropy 
    Dinh, T.-C.; Folk, R. (Condensed Matter Physics, 2009)
    Anisotropic antiferromagnets in an external magnetic field show a rich variety of different ground states meeting in transition lines and multicritical points. We study the dependence of the ground states of these systems ...
  • Helmholtz decomposition theorem and Blumenthal's extension by regularization 
    Petrascheck, D.; Folk, R. (Condensed Matter Physics, 2017)
    Helmholtz decomposition theorem for vector fields is usually presented with too strong restrictions on the fields and only for time independent fields. Blumenthal showed in 1905 that decomposition is possible for any ...
  • Marginal dimensions for multicritical phase transitions 
    Dudka, M.; Folk, R.; Holovatch, Yu.; Moser, G. (Condensed Matter Physics, 2012)
    The field-theoretical model describing multicritical phenomena with two coupled order parameters with n || and n⊥ components and of O(n||) ⊕ O(n⊥) symmetry is considered. Conditions for realization of different types of ...
  • Monte Carlo simulation of phase equilibria in Ising fluids and their mixtures 
    Fenz, W.; Folk, R. (Condensed Matter Physics, 2003)
    The mean field theory for the pure Ising fluid was recently extended to binary mixtures of an Ising and a van der Waals fluid. Depending on the relative interaction strengths, their three dimensional phase diagrams show ...
  • Multicritical behaviour in magnetic fluids 
    Schinagl, F.; Folk, R.; Iro, H. (Condensed Matter Physics, 1999)
    The phases of a magnetic fluid in an external field are considered. As model systems we take an ideal (hard core) gas with Ising interaction and a van der Waals gas with additional Heisenberg interaction. In mean ...
  • New optimized algorithms for molecular dynamics simulations 
    Omelyan, I.P.; Mryglod, I.M.; Folk, R. (Condensed Matter Physics, 2002)
    The method of molecular dynamics (MD) is a powerful tool for the prediction and investigation of various phenomena in physics, chemistry and biology. The development of efficient MD algorithms for integration of the ...
  • On the critical behaviour of random anisotropy magnets 
    Dudka, M.; Folk, R.; Holovatch, Yu. (Condensed Matter Physics, 2001)
    The effect of a local anisotropy of random orientation on a ferromagnetic phase transition is studied. To this end, a model of a random anisotropy magnet is analysed by means of a field theoretical renormalization ...
  • On the critical behaviour of random anisotropy magnets: cubic anisotropy 
    Dudka, M.; Folk, R.; Holovatch, Yu. (Condensed Matter Physics, 2001)
    The critical behaviour of an m -vector model with a local anisotropy axis of random orientation is studied within the field-theoretical renormalization group approach for cubic distribution of anisotropy axis. Expressions ...
  • On the universality class of a magnetic liquid in an external field 
    Folk, R.; Moser, G. (Condensed Matter Physics, 2010)
    Time scale ratios play an important role in critical dynamics. Their fixed point values govern the dynamical scaling behavior of the relevant fields and their dynamic correlation functions as well as the hydrodynamic ...
  • Spin dynamics simulations of collective excitations in magnetic liquids 
    Omelyan, I.P.; Mryglod, I.M.; Folk, R. (Condensed Matter Physics, 2000)
    A novel approach is developed for computer simulation studies of dynamical properties of spin liquids. It is based on the Liouville operator formalism of Hamiltonian dynamics in conjunction with Suzuki-Trotter-like ...