Nuclear spin dynamics near ferromagnetic phase transitions. II. Anisotropic systems

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The mode-coupling theory of critical dynamics has been applied to both electron and nuclear spin fluctuations of isotropic ferromagnets with electron-nuclear spin interactions. By treating nuclear and electron spin fluctuations in a similar manner, the influence of hyperfine interactions on nuclear as well as electron spin motion could be accounted for. It has thus been possible to derive the asymptotic q-k- omega dependence of the self-energies of electron and nuclear spin fluctuations in the entire critical region above Tc.