Scaling of the Low-Temperature Dephasing Rate in Kondo Systems

F. Mallet, J. Ericsson, D. Mailly, S. Ünlübayir, D. Reuter, A. Melnikov, A. D. Wieck, T. Micklitz, A. Rosch, T. A. Costi, L. Saminadayar, and C. Bäuerle
Phys. Rev. Lett. 97, 226804 – Published 30 November 2006

Abstract

We present phase coherence time measurements in quasi-one-dimensional Ag wires doped with Fe Kondo impurities of different concentrations ns. Because of the relatively high Kondo temperature TK4.3K of this system, we are able to explore a temperature range from above TK down to below 0.01TK. We show that the magnetic contribution to the dephasing rate γm per impurity is described by a single, universal curve when plotted as a function of T/TK. For T>0.1TK, the dephasing rate is remarkably well described by recent numerical results for spin S=1/2 impurities. At lower temperature, we observe deviations from this theory. Based on a comparison with theoretical calculations for S>1/2, we discuss possible explanations for the observed deviations.

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  • Received 6 July 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.226804

©2006 American Physical Society

Authors & Affiliations

F. Mallet1,2, J. Ericsson1,2, D. Mailly4, S. Ünlübayir5, D. Reuter5, A. Melnikov5, A. D. Wieck5, T. Micklitz6, A. Rosch6, T. A. Costi7, L. Saminadayar1,2,3, and C. Bäuerle1,2

  • 1Centre de Recherches sur les Très Basses Températures, B.P. 166 X, 38042 Grenoble Cedex 09, France
  • 2Institut Néel, B.P. 166 X, 38042 Grenoble Cedex 09, France
  • 3Université Joseph Fourier, B.P. 53, 38041 Grenoble Cedex 09, France
  • 4Laboratoire de Photonique et Nanostructures, route de Nozay, 91460 Marcoussis, France
  • 5Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität, Universitätsstr. 150, 44780 Bochum, Germany
  • 6Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany
  • 7Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany

See Also

Phase Coherence of Conduction Electrons Below the Kondo Temperature

Gassem M. Alzoubi and Norman O. Birge
Phys. Rev. Lett. 97, 226803 (2006)

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Vol. 97, Iss. 22 — 1 December 2006

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