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Anomalous temperature dependence of the dephasing time in mesoscopic kondo wires
Félicien Schopfer1, Christopher Bäuerle, Wilfried Rabaud
1Centre de Recherches sur les Très Basses Températures, BP 166 X, 38042 Grenoble CEDEX 9, France.
Abstract:
We present measurements of the magnetoconductance of long and narrow quasi-one-dimensional gold wires containing magnetic iron impurities in a temperature range extending from 15 mK to 4.2 K. The dephasing rate extracted from the weak antilocalization shows a pronounced plateau in a temperature region of 300-800 mK, associated with the phase breaking due to the Kondo effect. Below the Kondo temperature, the dephasing rate decreases linearly with temperature, in contradiction with standard Fermi-liquid theory. Our data suggest that the formation of a spin glass due to the interactions between the magnetic moments is responsible for the observed anomalous temperature dependence.
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