抄録
The magnetic properties of GdCo2 and Gd1−xYxCo2 have been observed and discussed in terms of the molecular field approximation. An appropriate set of interaction parameters reproduces the temperature dependence of the magnetization of GdCo2 and the concentration dependence of the Curie temperature of Gd1−xYxCo2 for x<0.2. Among the three kinds of interaction, the interaction between Gd and Co atoms plays the most important role in determining the Curie temperature. A negative deviation of the Curie temperature form the molecular field estimation, observed for x>0.2, suggests that the Co moment is suppressed by Y substitution and quite sensitive to magnetic environments. A stepwise anomaly in the temperature dependence of the magnetization previously reported could not be observed.
