%0 Journal Article
%J PHYSICAL REVIEW LETTERS
%D 2009
%T Kondo Decoherence: Finding the Right Spin Model for Iron Impurities in Gold and Silver
%A Costi, T. A.
%A Bergqvist, L.
%A Weichselbaum, A.
%A von Delft, J.
%A Micklitz, T.
%A Rosch, A.
%A P. Mavropoulos
%A P.H. Dederichs
%A Mallet, F.
%A Saminadayar, L.
%A Baeuerle, C.
%X We exploit the decoherence of electrons due to magnetic impurities, studied via weak localization, to resolve a long-standing 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-one-dimensional wires to numerical renormalization group predictions for S = 1/2, 1, and 3/2, finding excellent agreement for S = 3/2.
%B PHYSICAL REVIEW LETTERS
%V 102
%P 056802
%8 FEB 6
%G eng
%R 10.1103/PhysRevLett.102.056802