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

TL;DR

This paper applies and extends spin fluctuation theory to analyze the itinerancy of 5f electrons in actinide ferromagnets, revealing their itinerant nature and demonstrating the theory's applicability to actinide systems.

Contribution

It introduces a new analysis method for spin fluctuation parameters using a different theoretical formula, enhancing understanding of 5f electron itinerancy.

Findings

Most actinide ferromagnets exhibit itinerant 5f electrons.

Spin fluctuation theory effectively describes actinide 5f systems.

New theoretical formula provides consistent spin fluctuation parameters.

Abstract

Actinide compounds with 5f electrons have been attracting much attention because of their interesting magnetic and electronic properties such as heavy fermion state, unconventional superconductivity, co-existence of the superconductivity and magnetism. Recently, we have reported a phenomenological analysis on 80 actinide ferromagnets with the spin fluctuation theory originally developed to explain the ferromagnetic properties of itinerant ferromagnets in the 3d transition metals and their intermetallics (N. Tateiwa et al., Phys. Rev. B 96, 035125 (2017)). Our study suggests the itinerancy of the $5f$ electrons in most of the actinide ferromagnets and the applicability of the spin fluctuation theory to actinide 5f system. In this paper, we present a new analysis for the spin fluctuation parameter obtained with a different theoretical formula not used in the reference. We also discuss the results of the analysis from different points of views.