METAMAGNETIC TRANSITION BASED ON THE QUADRUPOLE-MOMENT IN DYCU2

We have measured the electrical resistivity, magnetoresistance, specif ic heat; thermal expansion, de Haas-van Alphen effect, magnetic suscep tibility and magnetization in DyCu2. The metamagnetic transtion has be en observed in a wide temperature range from 1.3 to 170 K. The transit ion field decreases with increasing the temperature up to the Neel tem perature of 27 K, while it increases linearly from about 50 K to 170 K . This metamagnetism is similar to that of PrCu2 and is explained on t he basis of the quadrupole interaction.