Abstract
A central enigma of the heavy fermion metals is the dual behaviour of the electrons which, at relatively short time scales, exhibit the properties expected of well-localised moments and, at very long time scales, in cooperation with other valence electrons at low temperatures, display the characteristics of massive itinerant carriers having a sharply defined Fermi surface. Detailed experimental support for the latter (long-time) cooperative behaviour of electrons in UPt3 and CeRu2Si2 has been furnished principally by studies of quantum oscillatory phenomena. In this paper the information provided by these studies is summarized, and recent observations of the evolution of the quasiparticle band structure during the magnetisation process and at the metamagnetic transitions in these materials are described.
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