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We report mSR experiments carried out on a series of heavy-electronpseudobinary compounds U(Pt1-xPdx)3 (x<=0.05). For x<=0.005 the zero-field muondepolarisation is described by the Kubo-Toyabe function. However thetemperature variation of the Kubo-Toyabe relaxation rate does not show any signof the small-moment antiferromagnetic phase with TN~6 K (signalled by neutrondiffraction), in contrast to previous reports. The failure to detect the smallordered moment suggests it has a fluctuating (> 10 MHz) nature, which isconsistent with the interpretation of NMR data. For 0.01<=x<=0.05 the muondepolarisation in the ordered state is described by two terms of equalamplitude: an exponentially damped spontaneous oscillation and a LorentzianKubo-Toyabe function. These terms are associated with antiferromagnetic orderwith substantial moments. The Knight-shift measured in a magnetic field of 0.6T on single-crystalline U(Pt0.95Pd0.05)3 in the paramagnetic state shows twosignals for B perpendicular to c, while only one signal is observed for B||c.The observation of two signals for B perpendicular to c, while there is onlyone muon localisation site (0,0,0), points to the presence of two spatiallydistinct regions of different magnetic response.Comment: 25 pages including 12 figures (PS), J. Phys.: Condens. Matter, in  prin

Magnetism in heavy-fermion U(Pt,Pd)3studied by muSR

Magnetism in heavy-fermion U(Pt,Pd)₃studied by muSR