Two Anderson impurities in the framework of the non-crossing approximation: Spectral functions and spin correlations

A. Schiller*, V. Zevin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Using a novel slave boson mapping, which was recently proposed by us for two Anderson impurities embedded in a metal, we present here spectral functions for all pseudoparticles involved in the mapping. These were numerically calculated in the framework of the Non-Crossing Approximation for different temperatures and inter-impurity distances, both for the degenerate (Nf = 6) and nondegenerate (Nf = 2) models. For the nondegenerate case, temperature dependencies of the partial occupancies and the spin-spin correlation function suggest that an antiferromagnetic (AFM)-like ground state is formed at suitable inter-impurity separation. By contrast, Kondo quenching of the impurity moments takes place for the isotropic Nf = 6 case even when a direct AFM interaction is introduced in order to amplify the indirect (inherent) one. Numerical calculations are in agreement with our previous prediction [Phys. Rev. B 47, 14,297 (1993)] that no AFM-like ground state can appear for two isotropic degenerate impurities.

Original languageEnglish
Pages (from-to)363-386
Number of pages24
JournalAnnalen der Physik
Volume508
Issue number4
DOIs
StatePublished - 1996

Keywords

  • Kondo effect
  • Magnetic impurities
  • Ruderman-Kittel-Kasuya-Yoshida interaction

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