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Theory of site-disordered magnets

  • T.M. Nieuwenhuizen
  • C.N.A. van Duin

Abstract:

In realistic spinglasses, such as \(\), \(\)and \(\), magnetic atoms are located at random positions. Their couplings are determined by their relative positions. For such systems a field theory is formulated. In certain limits it reduces to the Hopfield model, the Sherrington-Kirkpatrick model, and the Viana-Bray model. The model has a percolation transition, while for RKKY couplings the “concentration scaling”\(\) occurs. Within the Gaussian approximation the Ginzburg-Landau expansion is considered in the clusterglass phase, that is to say, for not too small concentrations. Near special points, the prefactor of the cubic term, or the one of the replica-symmetry-breaking quartic term, may go through zero. Around such points new spin glass phases are found.

PACS. 75.10.Nr Spin-glass and other random models - 75.30.Fv Spin-density waves - 75.50.Lk Spin glasses and other random magnets 

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Copyright information

© EDP Sciences, Springer-Verlag 1999

Authors and Affiliations

  • T.M. Nieuwenhuizen
    • 1
  • C.N.A. van Duin
    • 2
  1. 1.University of Amsterdam, Van der Waals-Zeeman Institut, Valckenierstraat 65-67, 1018 XE Amsterdam, The NetherlandsNL
  2. 2.Institute Lorentz for Theoretical Physics, Leiden University, P.O.B. 9506, 2300 RA Leiden, The NetherlandsNL

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