Theory of site-disordered magnets

Details Theory of site-disordered magnets Theory of site-disordered magnets

1998-04-14

arxiv.org/abs/cond-mat/9804143v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

26 pages Revtex, 6 figures

Scientific paper

10.1007/s100510050605

In realistic spinglasses, such as CuMn, AuFe and EuSrS, 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'' T_g proportional to c 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.

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