Abstract
We study the Anderson impurity model at T=0 taking into account double occupancy of the f-level. Particular emphasis is given to the limit when the f-level degeneracy Nf is large. In this limit there is an important asymmetry between the f0 and f2 configurations. We define a Kondo temperature δu for Nf→∞ and relate δu to the susceptibility and the f0 weight. δu depends on the band width in a nontrivial way. It is shown that the valence photoemission spectrum can change substantially as double occupancy is taken into account.
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Gunnarsson, O., Schönhammer, K. (1985). Ground-State and Spectroscopic Properties of the Finite U Anderson Model. In: Kasuya, T., Saso, T. (eds) Theory of Heavy Fermions and Valence Fluctuations. Springer Series in Solid-State Sciences, vol 62. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82618-4_8
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DOI: https://doi.org/10.1007/978-3-642-82618-4_8
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