Magnetic susceptibility and single-impurity effects in dilute AgMn alloys

The magnetic susceptibility, chi , of AgMn alloys with concentrations, c, between 10 at ppm and 4 at.% has been measured in the temperature and field ranges 1.4-300K and 0.9-8.5 kOe. The impurity susceptibility has been analysed according to a modified Curie-Weiss law chi = chi 0 +(C/(T+ theta )). The effective magnetic Mn moment is p=(5.1+or-0.1) mu B and theta =(0.05+or-0.04)K for c<0.1 at.%. For c>or approximately=0.5 at.%, theta is dependent on the concentration and p=(5.4+or-0.1) mu B . The susceptibility is independent of concentration over the whole temperature range for c