Mossbauer investigation of the itinerant magnets U(Ga0.98Sn0.02)(3) and CeFe2

The theoretical predictions that UGa3 and CeFe2 should be regarded as itine rant magnets stimulated new investigations. In this paper we focus on Mossb auer measurements aimed to characterize their magnetic properties. We show that the analysis of the transferred hyperfine interactions at the Sn-119 n uclei in U(Ga0.98Sn0.02)(3), a type II antiferromagnet, provides direct inf ormation on the f-p hybridization and allows to determine the orientation o f the U moments. The study of CeFe2 demonstrates that the intrinsic ferroma gnetism coexists with short range antiferromagnetic correlations. The insta bility of the ferromagnetic state is illustrated by doping CeFe2 with a sma ll amount of Co and by application of pressure on pare CeFe2. Our results w ill be discussed in connection with neutron and synchrotron experiments.