MAGNETIC-TO-NONMAGNETIC TRANSITION IN THE PSEUDOBINARY SYSTEM U(GA1-XSNX)3

The temperature dependences of both the electrical resistivity and mag netic susceptibility were measured for the pseudobinary alloy U(Ga1-xS nx)3. Moreover, the temperature variation of the specific heat was det ermined for UGa3. The results show a clear evolution in magnetic behav ior of the system studied from a weakly temperature-dependent paramagn etism with a long-range antiferromagnetic ordering at 67 K in UGa3 to a strongly temperature-dependent paramagnetism, but without any magnet ic order, in USn3. The properties of UGa3 are discussed in terms of it inerant 5f-electron magnetism. In contrast, some arguments are given f or local 5f-electrons in USn3, which behaves as a nonmagnetic ''Kondo- lattice'' system with T(K) congruent-to 60 K.