Magnetic Properties of Weak Itinerant Electron Ferromagnet Au4 V Under High Magnetic Fields

Abstract

Intermetallic compound Au4 V with a Ni 4 Mo-type tetragonal is a weak itinerant electron ferromagnet (WIEF) with a Curie temperature $T_{\text{C}}$ of 42 K [1], [2]. For WIEF, Takahashi proposed a spin fluctuation theory, in which quantum spin fluctuations (zero-point spin fluctuations) were considered [2], [3]. In this study, we performed magnetization measurements of Au4 V in magnetic fields $H$ up to 130 kOe in order to estimate the characteristic parameters $(T_{0}$ and $T_{\text{A}})$ of Takahashi's spin fluctuation theory.