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The cubic Laves phase compounds form a wide class of magnetic materials with important applications. Starting some 20 years ago the heavy rare-earth iron materials (REFe{2}) were studied with neutron scattering. The high T(c) of these materials is a consequence of strong Fe-Fe interactions, but the intrinsic anisotropy is provided by the RE-Fe interaction. The situation is more complex for itinerant systems such as CeFe(2) and Ufe(2). in which a strong hybridisation occurs between the f states of the Ce or U-ions and the 3d electrons of Fe. In these materials there is no observable response that can be associated with the f states. but the Fe spin waves are substantially modified. For example, their spin-wave stiffness is enhanced in Ufe(2), whereas it is reduced and anti ferromagnetic (AF) fluctuations are found in CeFe(2). Doping CeFe(2) with a small amount of Co stabilizes the AF ground state, but it can be quenched with a modest magnetic field, and this leads to a large magnetoresistance. We review briefly neutron inelastic scattering measurements on single crystals of Yfe(2), Ufe(2). CeFe(2), and Co-doped CeFe(2).

Additional information

Authors: PAOLASINI L, European Synchrotron Radiation Facility, Grenoble (FR);LANDER G.H, ITU, Karlsruhe, (DE)
Bibliographic Reference: Article: Elsevier Science, Journal of Alloys and Compounds 303-304 (2000) pp 232-238; Oral Report: 22nd Rare-Earth Research Conference Argonne National Library, 1-15 July 1999
Availability: 1 as paper EN 60450 ORA
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