Abstract
At finite temperature the picture of renormalized-hybridization quasiparticle bands, obtained by various formalisms at T=0, is shown to be inadequate in several respects. The most significant refinement recognizes the existence of a new type of elementary excitation, which simply creates (i.e., unbinds or unscreens) a local moment at an arbitrary lattice site. These excitations explain the continuous crossover between the contrasting T\ensuremath{\ll}${T}_{K}$ and T\ensuremath{\gg}${T}_{K}$ behaviors. They also explain the surprisingly rapid weakening, with increasing T, of inelastic peaks in neutron scattering. The concept of ``coherence'' is clarified. Numerical results are presented for entropy, specific heat, average valence, magnetic susceptibility, and inelastic neutron scattering.
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