Variation of the Susceptibility with Magnetic Field in Iron-Monosilicide

抄録

Magnetic field dependence of the magnetic susceptibility of Iron-Monosilicide FeSi was measured to investigate the mode-mode coupling for spin fluctuations. The susceptibility increases with magnetic field, and straight lines in Arrott plots have negative slope. These results suggest that mode-mode coupling for spin fluctuations is negative. This fact is in substantial agreernent with theoretical predictions proposed by Takahashi and Moriya on the basis of a unified picture of itinerant electron magnetism.