TY - JOUR
T1 - Kondo Decoherence: Finding the Right Spin Model for Iron Impurities in Gold and Silver
JF - PHYSICAL REVIEW LETTERS
Y1 - 2009
A1 - Costi, T. A.
A1 - Bergqvist, L.
A1 - Weichselbaum, A.
A1 - von Delft, J.
A1 - Micklitz, T.
A1 - Rosch, A.
A1 - P. Mavropoulos
A1 - P.H. Dederichs
A1 - Mallet, F.
A1 - Saminadayar, L.
A1 - Baeuerle, C.
AB - 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.
VL - 102
ER -