Abstract
By Monte Carlo simulations the phase transition is investigated for bond- and site-disordered Ising ferromagnets with special emphasis to the temperature dependence of the paramagnetic susceptibility chi 0(T) outside the real critical temperature range. For site-disordered systems a large temperature range of deviations from the Curie-Weiss law and a non-monotonic temperature dependence of the effective exponent gamma (T)=(T-Tc) chi 0(dchi 0-1/dT) was found, in close analogy with the experimentally observed behaviour of amorphous Heisenberg ferromagnets. Bond disorder affects the critical temperature Tc but has little influence on the temperature dependence of chi 0(T).
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