Phys. Rev. Lett. 97, 226804 (2006) [4 pages]Scaling of the Low-Temperature Dephasing Rate in Kondo SystemsReceived 6 July 2006; published 30 November 2006 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 TK≈4.3 K 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.226804
DOI:
10.1103/PhysRevLett.97.226804
PACS:
73.23.−b, 72.15.Qm, 73.20.Fz, 75.20.Hr
See AlsoSee Also: Gassem M. Alzoubi and Norman O. Birge, Phase Coherence of Conduction Electrons Below the Kondo Temperature, Phys. Rev. Lett. 97, 226803 (2006). |
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