Abstract
A review is given of investigations of the quasiparticle spectra and of the magnetic fluctuations spectra of metals with strong longitudinal magnetic susceptibilities which were performed by means of the de Haas-van Alphen effect and inelastic neutron scattering. Among the systems investigated are the incipient ferromagnets Ni3Ga and TiBe2, the low temperature ferromagnets Ni3Al, YNi3, ZrZn2 and MnSi, the light rare earth metals including PrCu2 which are close to antiferromagnetic instabilities at low temperatures, and the actinide heavy fermion superconductors UPt3 and UBe13. The strong renormalisation of the quasiparticle masses and the temperature dependence of the heat capacity and of the magnetic equation of state of these systems are discussed in terms of a quantitative model based on the relaxation frequency of very low lying spin fluctuations.
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