The correlation function of the z components (parallel to the net magnetization) of two spins in a Heisenberg ferromagnet is computed by a Green function analysis. The results extend spin-wave theory to higher temperatures, although they are not satisfactory near the Curie temperature. The Fourier transform of the correlation function varies as 1/k for small k, with a more complicated behavior at large k.
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Tahir-Kheli et al. (1964) studied this question.
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