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Anomalous temperature dependence of the dephasing time in mesoscopic Kondo wires

Félicien Schopfer·Christopher Bäuerle·Wilfried Rabaud·Laurent Saminadayar
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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 antilocalisation shows a pronounced plateau in a temperature region of $300 $mK - $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 are responsible for the observed anomalous temperature dependence.

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Félicien Schopfer, Christopher Bäuerle, Wilfried Rabaud, Laurent Saminadayar. 2002-12-17. Anomalous temperature dependence of the dephasing time in mesoscopic Kondo wires. https://doi.org/10.1103/physrevlett.90.056801

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