Electron Coherence in Mesoscopic Kondo Wires

Details Electron Coherence in Mesoscopic Kondo Wires Electron Coherence in Mesoscopic Kondo Wires

2003-06-11

arxiv.org/abs/cond-mat/0306276v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Advances in Solid State Physics, Vol 43, edited by B. Kramer (Springer Verlag, Berlin 2003)

Scientific paper

We present measurements of the magnetoresistance of long and narrow quasi one-dimensional gold wires containing magnetic iron impurities. The electron phase coherence time 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 phase coherence time increases, as expected in the framework of Kondo physics. At much lower temperatures, the phase coherence time saturates again, in contradiction with standard Fermi liquid theory. In the same temperature regime, the resistivity curve displays a characteristic maximum at zero magnetic field, associated with the formation of a spin glass state. We argue that the interactions between the magnetic moments are responsible for the low temperature saturation of the phase coherence time.

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