High-Field Magnetization of USn₃ and UPb₃

Abstract

UX 3 (X=Si, Ge, Sn and Pb) compounds with the cubic crystal structure are interesting in relation with the lattice constant and the electronic state of 5 f electrons.We measured the high-field magnetization of USn 3 and UPb 3 grown by the self-flux method.The broad metamagnetic transition was observed in a heavy fermion paramagnetic compound USn 3 at about 30 T, which is similar to the metamagnetism of UPt 3 . On the other hand, the sharp metamagnetic transitions were observed in an antiferromagnetic compound UPb 3 .