Anomalous temperature dependence of the dephasing time in mesoscopic kondo wires

Anomalous temperature dependence of the dephasing time in mesoscopic kondo wires

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 regi...

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Bibliographic Details
Published in:Physical review letters Vol. 90; no. 5; p. 056801
Main Authors: Schopfer, Félicien, Bäuerle, Christopher, Rabaud, Wilfried, Saminadayar, Laurent
Format: Journal Article
Language:English
Published: United States American Physical Society 07-02-2003
Subjects:
Condensed Matter
Mesoscopic Systems and Quantum Hall Effect
Physics
Online Access:Get full text
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Summary: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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ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.90.056801