Abstract
We present muon spin relaxation measurements performed at the Rutherford Appleton Laboratory in metallic compounds well known to be characterized by small magnetic moments, if any. Thanks to the low background we are able to unambiguously differentiate the various functions for the decay of the muon depolarisation. This allows one to distinguish between dynamical (YbB 12) and static (URu 2Si 2, CeRu 2) magnetic correlations, and between a disordered magnet (CeRu 2) and a magnet with a limited correlation length (URu 2Si 2). Surprisingly, in UPt 3 we do not find any signature of electronic magnetic correlations.
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