抄録
Specific heat, AC susceptibility and magnetization have been measured on the mixed crystal of the cubic (CsCl-type) rare earth intermetallic compound Ce1−xNdxAg (0≤x≤1). From the estimation of the magnetic contribution to the specific heat, it is found that Ce ion has a doublet state and Nd ion has a quartet state for the ground 4f energy level at any concentration of Nd. The magnetic x-T phase diagram was obtained from the temperature of the maximum in the specific heat and the susceptibility and the temperature of the magnetization disappearance. For 0.5<x<0.8 antiferromagnetic↔weak-ferromagnetic phase transition occurs, where no anomalous behaviour in the specific heat is observed. This is analyzed to be due to the existence of a strong higher-order interaction in addition to the simple molecular field as Hexch(exchange field)=λM+λ′M3.
