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Article Dans Une Revue Physical Review Letters Année : 2009

Kondo decoherence: finding the right spin model for iron impurities in gold and silver

T. A. Costi
  • Fonction : Auteur
L. Bergqvist
  • Fonction : Auteur
A. Weichselbaum
  • Fonction : Auteur
T. Micklitz
  • Fonction : Auteur
A. Rosch
  • Fonction : Auteur
P. Mavropoulos
  • Fonction : Auteur
P. H. Dederichs
  • Fonction : Auteur
F. Mallet

Résumé

We exploit the decoherence of electrons due to magnetic impurities, studied via weak localization, to resolve a longstanding question concerning the classic Kondo systems of Fe impurities in the noble metals gold and silver: which Kondo-type model yields a realistic description of the relevant multiple bands, spin and orbital degrees of freedom? Previous studies suggest a fully screened spin $S$ Kondo model, but the value of $S$ remained ambiguous. We perform density functional theory calculations that suggest $S = 3/2$. We also compare previous and new measurements of both the resistivity and decoherence rate in quasi 1-dimensional wires to numerical renormalization group predictions for $S=1/2,1$ and 3/2, finding excellent agreement for $S=3/2$.

Dates et versions

hal-00993995 , version 1 (20-05-2014)

Identifiants

Citer

T. A. Costi, L. Bergqvist, A. Weichselbaum, J. von Delft, T. Micklitz, et al.. Kondo decoherence: finding the right spin model for iron impurities in gold and silver. Physical Review Letters, 2009, 102, pp.056802. ⟨10.1103/PhysRevLett.102.056802⟩. ⟨hal-00993995⟩
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