Abstract
We present phase coherence time measurements in quasi-one-dimensional Ag wires doped with Fe Kondo impurities of different concentrations . Because of the relatively high Kondo temperature of this system, we are able to explore a temperature range from above down to below . We show that the magnetic contribution to the dephasing rate per impurity is described by a single, universal curve when plotted as a function of . For , the dephasing rate is remarkably well described by recent numerical results for spin impurities. At lower temperature, we observe deviations from this theory. Based on a comparison with theoretical calculations for , we discuss possible explanations for the observed deviations.
- Received 6 July 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.226804
©2006 American Physical Society