The heavy fermion compound YbAgCu4

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Abstract
We re‐examine the experimental data for the specific heat, the magnetic susceptibility, magnetization, and inelastic neutron scattering for the moderately heavy‐electron compound YbAgCu4 within the framework of the single‐ion Anderson model. Such an analysis has previously given excellent agreement between theory and experiment for numerous light heavy‐fermion compounds. We extend here previous interpretations for the specific heat and magnetization within the Coqblin–Schrieffer model to a common set of model parameters by incorporating a weak valence admixture. The crystalline field splitting in this compound appears to be small compared to the Kondo temperature. Existing exact solutions of the Anderson model within the framework of Bethe’s ansatz are used for the thermodynamic properties. A simple resonant‐level model is introduced to parametrize the Kondo resonance and to qualitatively interpret the inelastic neutron scattering cross section.