Bethe ansatz results for the 4f-electron spectra of a degenerate Anderson model.
We show that the density of states for localized 4f electrons coupled to a conduction band calculated in the framework of Bethe ansatz solution for the degenerate Anderson model qualitatively disagree with the well-known results obtained for the same model but using a variational approach. The scales of parameters used in our Bethe ansatz calculations to fit the experiments disagree with the commonly accepted values from other studies. This implies narrower conduction bands hybridized with 4f orbitals or questions the applicability of the Bethe ansatz for a degenerate Anderson model for the high-energy characteristics of some rare-earth systems.
Zvyagin
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Max Planck Institut für Physik komplexer Systeme, D-01187 Dresden, Germany.