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The varying magnitude of the coupling of the 5f electrons with the conduction electrons in uranium intermetallics is reflected in the diverse magnetic behaviour that these compounds exhibit. Upd(3) represents the canonical example of localised moment magnetism, and the antiferroquadrupolar ordering in this system has been directly observed by X-ray resonant scattering. Crystal field excitations have been observed, by inelastic neutron scattering, in Upd(3) and several other systems, including UPdSn, UNiSn and U(3)Pd(20)Si(6). In (U,Y) Pd(3) the excitations become progressively broadened as the hybridisation with the conduction electrons increases. Diffusive and propagating spin waves are found in the heavy fermion antiferromagnet U(Pd(0.05)Pt(0.95){3}. Non-Fermi liquid behaviour is observed in U(2)Pt(2). In: measurements of the dynamical susceptibility show the characteristic E/T scaling found in other NFL systems.

Additional information

Authors: MC EWEN A, University College London, Department of Physics and Astronomy, London (UK);BULL M.J, Rutherford Appleton Laboratory, Chilton (UK);MARTIN-MARTIN A, JRC-Institute for Transuranium Elements, Karlsruhe (DE)
Bibliographic Reference: Oral report given at: The 1st International Symposium on Advanced Science Research: Advances in Neutron Scattering Research. Held at: Tokai (JP), 31 October-2 November 2000
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