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Actinide compounds with 5f electrons have been attracting much attentionbecause of their interesting magnetic and electronic properties such as heavyfermion state, unconventional superconductivity, co-existence of thesuperconductivity and magnetism. Recently, we have reported a phenomenologicalanalysis on 80 actinide ferromagnets with the spin fluctuation theoryoriginally developed to explain the ferromagnetic properties of itinerantferromagnets in the 3d transition metals and their intermetallics (N. Tateiwaet al., Phys. Rev. B 96, 035125 (2017)). Our study suggests the itinerancy ofthe $5f$ electrons in most of the actinide ferromagnets and the applicabilityof the spin fluctuation theory to actinide 5f system. In this paper, we presenta new analysis for the spin fluctuation parameter obtained with a differenttheoretical formula not used in the reference. We also discuss the results ofthe analysis from different points of views.

Phenomenological approach to study the degree of the itinerancy of the $5f$ electrons in actinide ferromagnets with spin fluctuation theory