Specific heat and magnetization in dilute magnetic alloys

摘要: We have studied dilute alloys where interactions of the Ruderman-Kittel-Yosida type are assumed to exist between well-defined magnetic moments that localized on impurities distributed at random in matrix. Using a molecular field model, such as has been proposed by Blandin and Friedel, 12 we show that, because geometrical characteristics interaction, simple correspondences expected properties (specific heat magnetization) given alloy for different values solute concentrationc. These quantities expressed through concentration-independent functions “reduced temperature,”T/c, field,”h/c. The idea diagrams,” plot both new available data terms ofT/c andh/c, follows from these functions. Generally good agreement is observed specific heat, magnetization, initial susceptibility, residual magnetization number alloys. (The used here theAu-Fe,Cu-Mn andAg-Mn systems.) Furthermore, discrepancies, due other mechanisms, Kondo effect, or effect mean free path limitation may better appear diagrams.