NEUTRON-DIFFRACTION STUDY OF THE EVOLUTION OF ANTIFERROMAGNETIC ORDER IN UPT3 DOPED WITH PD

Neutron-diffraction experiments have been carried out on U(Pt1-xPdx)3 single crystals (x = 0.01 a large moment antiferromagnetic phase (LMAF) is found. For this phase at optimum doping (x= 0.05) TN attains a maximum value of 5.8 K and the ordered moment equals 0.63(5) mB/U-atom. TN(x) for the LMAF follows a Doniach-type phase diagram. We infer that the antiferromagnetic instability in U(Pt1-xPdx)3 is located in the range 0.5-1 at.% Pd.