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

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

2008-10-09

arxiv.org/abs/0810.1771v2

Phys. Rev. Lett. 102, 056802 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, shortened for PRL

Scientific paper

10.1103/PhysRevLett.102.056802

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 $S=3/2$.

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