Journal Article

PreJuSER-3474

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Kondo Decoherence: finding the right spin model for iron impurities in gold and silver

Costi, T. A.FZJ* ; Bergqvist, L.FZJ* ; Weichselbaum, A. ; von Delft, J. ; Micklitz, T. ; Rosch, A. ; Mavropoulos, P.FZJ* ; Dederichs, P. H.FZJ* ; Mallet, F. ; Saminadayar, L. ; Bäuerle, C.

2009
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7195  doi:10.1103/PhysRevLett.102.056802

Abstract: 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.

Keyword(s): J

Note: L. B. acknowledges support from the EU within the Marie Curie Actions for Human Resources and Mobility; P. M. from the ESF program SONS, Contract No. ERAS-CT2003-980409; T. M. from the U. S. Department of Energy, Office of Science, Contract No. DE-AC0206CH11357; L. S. and C. B. acknowledge technical support from the Quantronics group, Saclay, and A. D. Wieck and financial support from ANR PNANO "QuSPIN.''Support from the John von Neumann Institute for Computing (Julich), the DFG (SFB 608, SFB-TR12, and De730/3-2) and from the Cluster of Excellence Nanosystems Initiative Munich is gratefully acknowledged.

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Contributing Institute(s):

1. Theorie der Strukturbildung (IFF-3)
2. Quanten-Theorie der Materialien (IAS-1)
3. Theoretische Nanoelektronik (IAS-3)
4. Quanten-Theorie der Materialien (IFF-1)
5. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)
6. JARA - HPC (JARA-HPC)

Research Program(s):

1. Kondensierte Materie (P54)
2. Non-equilibrium dynamics of fermionic atoms in optical lattices; transport at oxide interfaces (jiff23_20090701)

Appears in the scientific report 2009

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