Influence de la nature de l'élément de transition M sur le comportement magnétique de l'uranium dans de nouveaux siliciures et germaniures ternaires UsMtXv (M = Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt et X = Si,Ge)

摘要

Structural, magnetic and electrical properties of three new series of ternary compounds based on uranium (U2M3X5, U2MSi3 and UMEG2) were determined. The magnetic state of uranium in these compounds depends on the nature of the transition element M. This behavior is explained by significant competition between Kondo-type interactions and magnetic interactions type RKKY This accounts for the non-magnetic magnetic transition undergone by uranium in some systems.