The authors develop exact methods, based on the real space renormalisation group, for calculating dynamic structure factors of Heisenberg ferromagnets. The method is applied to a pure chain, a Sierpinski gasket and a quasi-one-dimensional model of a dilute chain. The result for the Sierpinski gasket exhibits a rich structure because of the requirement of discrete scale invariance. By the use of the distribution scaling the method is generalised to treat a randomly diluted chain.
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Maggs et al. (1986) studied this question.
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