title: Scaling of the low-temperature dephasing rate in Kondo systems.
abstract: We present phase coherence time measurements in quasi-one-dimensional Ag wires doped with Fe Kondo impurities of different concentrations n_{s}. Because of the relatively high Kondo temperature T_{K} approximately 4.3 K of this system, we are able to explore a temperature range from above T_{K} down to below 0.01T_{K}. We show that the magnetic contribution to the dephasing rate gamma_{m} per impurity is described by a single, universal curve when plotted as a function of T/T_{K}. For T>0.1T_{K}, 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.
authors.affiliation: Centre de Recherches sur les Très Basses Températures, B.P. 166 X, 38042 Grenoble Cedex 09, France.
authors.forename: F
authors.initials: F
authors.lastname: Mallet
authors.forename: J
authors.initials: J
authors.lastname: Ericsson
authors.forename: D
authors.initials: D
authors.lastname: Mailly
authors.forename: S
authors.initials: S
authors.lastname: Unlübayir
authors.forename: D
authors.initials: D
authors.lastname: Reuter
authors.forename: A
authors.initials: A
authors.lastname: Melnikov
authors.forename: A D
authors.initials: AD
authors.lastname: Wieck
authors.forename: T
authors.initials: T
authors.lastname: Micklitz
authors.forename: A
authors.initials: A
authors.lastname: Rosch
authors.forename: T A
authors.initials: TA
authors.lastname: Costi
authors.forename: L
authors.initials: L
authors.lastname: Saminadayar
authors.forename: C
authors.initials: C
authors.lastname: Bäuerle