The origin of heavy fermions in f-electron compounds with nearly integer valence is discussed. General arguments in favor of uncharged Fermi excitations of spin origin as the quasiparticles giving the main contribution to the low-T thermodynamics are present. We find a strong renormalization of the conduction band energy spectrum due to inelastic scattering by the spin-liquid which, however, is non-universal, and in the general case the effective mass of the charged carriers is less than the low-T thermodynamic mass. We show that the interaction with the spin liquid, in contrast with phonons, leads to the explicit Dingle factor in the amplitude of the dHvA effect.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering