Iron impurities in gold and silver: Comparison of transport measurements to numerical renormalization group calculations exploiting non-Abelian symmetries

M. Hanl, A. Weichselbaum, T. A. Costi, F. Mallet, L. Saminadayar, C. Bäuerle, and J. von Delft
Phys. Rev. B 88, 075146 – Published 30 August 2013

Abstract

We consider iron impurities in the noble metals gold and silver and compare experimental data for the resistivity and decoherence rate to numerical renormalization group results. By exploiting non-Abelian symmetries, we show improved numerical data for both quantities as compared to previous calculations [Costi et al., Phys. Rev. Lett. 102, 056802 (2009).], using the discarded weight as criterion to reliably judge the quality of convergence of the numerical data. In addition, we also carry out finite-temperature calculations for the magnetoresistivity of fully screened Kondo models with S=12, 1, and 32, and compare the results with available measurements for iron in silver, finding excellent agreement between theory and experiment for the spin-32 three-channel Kondo model. This lends additional support to the conclusion of Costi et al. that the latter model provides a good effective description of the Kondo physics of iron impurities in gold and silver.

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  • Received 18 May 2013

DOI:https://doi.org/10.1103/PhysRevB.88.075146

©2013 American Physical Society

Authors & Affiliations

M. Hanl1, A. Weichselbaum1, T. A. Costi2, F. Mallet3, L. Saminadayar3,4, C. Bäuerle3, and J. von Delft1

  • 1Physics Department, Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, Ludwig-Maximilians-Universität München, 80333 München, Germany
  • 2Peter Grünberg Institut and Institute for Advanced Simulation, Research Centre Jülich, 52425 Jülich, Germany
  • 3Institut Néel-CNRS and Université Joseph Fourier, 38042 Grenoble, France
  • 4Institut Universitaire de France, 103 boulevard Saint-Michel, 75005 Paris, France

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Vol. 88, Iss. 7 — 15 August 2013

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