MONTE CARLO SIMULATION OF THE CRITICAL PROPERTIES OF QUASI-TWO-DIMENSIONAL QUANTUM HEISENBERG SYSTEMS

I.V. Rojdestvenski, M.G. Cottam, I.A. Favorski, T. Kuznetsova and P.N. Vorontsov-Velyaminov
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I.V. Rojdestvenski: Department of Physics, University of Western Ontario, London, Ontario, Canada N6A 3K7, Canada
M.G. Cottam: Department of Physics, University of Western Ontario, London, Ontario, Canada N6A 3K7, Canada
I.A. Favorski: Faculty of Physics, Leningrad State University, Russia
T. Kuznetsova: Faculty of Physics, Leningrad State University, Russia
P.N. Vorontsov-Velyaminov: Faculty of Physics, Leningrad State University, Russia

Surface Review and Letters (SRL), 1994, vol. 01, issue 02n03, 239-252

Abstract: The critical properties of spinS=1/2isotropic Heisenberg ferromagnetic ultrathin films are investigated using the Handscomb Monte Carlo technique. We study a simple cubic lattice with nearest neighbor interactions, including the effects of different values for the interlayer and intralayer exchange parameters. The number of monolayers is taken as 1, 2, or 3, and also we examine the effects of dilution in one of the layers. Numerical calculations are presented for the critical behavior of the longitudinal susceptibility and the spin correlation range. The results are interpreted in terms of a two-dimensional type of critical behavior with renormalized (modified) exchange parameters.

Keywords: 75.70.Ak; 75.40.Mg; 64.60.Cn (search for similar items in EconPapers)
Date: 1994
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DOI: 10.1142/S0218625X94000242

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