Abstract
In heavy fermion (HF) compounds the proximity of the 4f (5f) level to the Fermi energy allows a strong hybridisation between the 4f (5f) electrons and the band and valence electrons. This leads to a magnetic instability: HF either do not exhibit long range magnetic ordering or show antiferromagnetism with very small ordered magnetic moment. Large magnetic fluctuations are present even in the ordered state. The neutron scattering techniques is an excellent tool for the study of the heavy fermion systems. The low temperature ordering can be studied in detail by neutron diffraction while inelastic scattering give access to space and time dependence of the fluctuation spectrum. The more significant heavy fermion systems already known will be briefly reviewed and some typical examples will illustrate the neutron studies of the HF compounds.
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More From: Journal of Magnetism and Magnetic Materials
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