title: Anomalous temperature dependence of the dephasing time in mesoscopic kondo wires.
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.
authors.affiliation: Centre de Recherches sur les Très Basses Températures, BP 166 X, 38042 Grenoble CEDEX 9, France.
authors.forename: Félicien
authors.initials: F
authors.lastname: Schopfer
authors.forename: Christopher
authors.initials: C
authors.lastname: Bäuerle
authors.forename: Wilfried
authors.initials: W
authors.lastname: Rabaud
authors.forename: Laurent
authors.initials: L
authors.lastname: Saminadayar