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 $n_s$. Due to the relatively high Kondo temperature $T_K\approx 4.3K$ 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.

4 pages, 3 figures, submitted to Phys. Rev. Lett

References in corpus (2)

• Theory of inelastic scattering from magnetic impurities
• Universal dephasing rate due to diluted Kondo impurities

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