The effective Curie-Weiss constant of ferromagnetic metals and alloys

摘要: Experimental data for the Curie-Weiss constant and saturation magnetization of a wide variety ferromagnetic substances are used to calculate respective values numbers magnetic carriers, q$\_c$ q$\_s$. A plot ratio q$\_c$/q$\_s$ as dependent on Curie temperatures reveals two branches. For one these is about 1, other > 1. The first branch corresponds substances, such gadolinium compound MnSb, which accord with purely localized model ferromagnetism. second nickel its alloys, dilute alloys palladium compounds Sc$\_3$ In ZrZn$\_2$, according `intermediate model' (Edwards 1962), reduces in present context collective electron Calculations quantity closely related have been made different forms density states curve, including sharp peak. general theoretical curves satisfactory qualitative agreement form experimental results. also derive variation iron, cobalt content number holes per atom relative at 0 $^\circ$K.