Anomalous temperature dependence of the dephasing time in mesoscopic Kondo wires

Details Anomalous temperature dependence of the dephasing time in mesoscopic Kondo wires Anomalous temperature dependence of the dephasing time in mesoscopic Kondo wires

2002-12-17

arxiv.org/abs/cond-mat/0212420v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures. Phys. Rev. Lett., in press

Scientific paper

10.1103/PhysRevLett.90.056801

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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