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Influence of a ferromagnetic exchange interaction on the Kondo effect in Anderson impurity systems

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Zeitschrift für Physik B Condensed Matter

Abstract

In the usual description of heavy fermion systems by the Anderson Hamiltonian the Coulomb interaction is taken into account explicitly only betweenf-electrons. All the other parts of the Coulomb interaction, in particular the Coulomb interaction betweenf-electrons and conduction electrons, are contained only on the average in the parameters of the Hamiltonian. In this paper the ferromagnetic exchange interaction between conduction andf-electrons is added explicitly to the single-ion Anderson Hamiltonian, and its influence on the appearance of a Kondo effect in such systems is studied. This is done with help of a self-consistent perturbation theory in the hybridization and the exchange interaction. The results, which show a strong competition between the antiferromagnetic interaction induced by the hybridization off-electrons and conduction electrons are compared with the results of an earlier mean-field calculation.

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Authors and Affiliations

  1. Institut für Theoretische Physik der Universität Regensburg, W-8400, Regensburg, Germany

    R. Freytag & J. Keller

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  1. R. Freytag
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  2. J. Keller
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Freytag, R., Keller, J. Influence of a ferromagnetic exchange interaction on the Kondo effect in Anderson impurity systems. Z. Physik B - Condensed Matter 85, 87–92 (1991). https://doi.org/10.1007/BF01387791

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  • DOI: https://doi.org/10.1007/BF01387791

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