Longitudinal and transverse static spin fluctuations in layered ferromagnets and antiferromagnets
- Katanin, A.
DOIAbstract
We analyze the momentum dependence of static susceptibilities of layered local-moment systems below Curie (Neel) temperature within the 1/S expansion, the renormalization-group (RG) approach, and the first order of the 1/N expansion. We argue that already at sufficiently low temperatures the previously known results of the spin-wave theory and RG approach for the transverse spin susceptibility acquire strong corrections, which appear due to the interaction of the incoming magnon having momentum q with virtual magnons having momenta k<q. Such corrections cannot be treated in the standard RG approach but can be described by both 1/S and 1/N expansions. The results of these expansions can be successfully extrapolated to T=TM, yielding the corr...
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