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

2 QUANTRONICS - Quantronics Group
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : 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 $S=3/2$.
Document type :
Journal articles

https://hal.archives-ouvertes.fr/hal-00993995
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Submitted on : Tuesday, May 20, 2014 - 7:03:14 PM
Last modification on : Monday, December 13, 2021 - 9:14:36 AM

### Citation

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, American Physical Society, 2009, 102, pp.056802. ⟨10.1103/PhysRevLett.102.056802⟩. ⟨hal-00993995⟩

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