DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2009 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 46: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 46.5: Talk

Friday, March 27, 2009, 11:30–11:45, HSZ 301

Kondo decoherence: finding the right spin model for iron impurities in gold and silver — •Theodoulos Costi1, Lars Bergqvist1, Andreas Weichselbaum2, Jan von Delft2, Phivos Mavropoulos1, Peter Dederichs1, Tobias Micklitz3,5, Achim Rosch3, Francois Mallet4, Laurent Saminadayar4, and Christopher Bäuerle41Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Physics Department, Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience,Ludwig-Maximilians-Universität München, 80333 München, Germany — 3Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany — 4Institut Néel - CNRS and Université Joseph Fourier, 38042 Grenoble Cedex 09, France — 5Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

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.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2009 > Dresden