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Theory of Helical Spin Structure in Itinerant Electron Systems. II

The self-consistent renormalization theory of spin fluctuations as developed previously for ferro- and antiferromagnetic metals is extended to the case of a helical spin structure with the use of a model for the dynamical susceptibility χ 0 ( q ,ω) of the noninteracting system. The magnetic properties of MnSi having a helical spin structure of a long period below T C =29 K are discussed on the basis of this theory.