Enhancement of the Kondo temperature of magnetic impurities in metallic point contacts due to the fluctuations of the local density of states

Details Enhancement of the Kondo temperature of magnetic impurities in metallic point contacts due to the fluctuations of the local density of states Enhancement of the Kondo temperature of magnetic impurities in metallic point contacts due to the fluctuations of the local density of states

1996-05-10

arxiv.org/abs/cond-mat/9605063v1

Physics

Condensed Matter

11 pages, uuencoded gz-compressed tar-files, latex, figures in a PostScript file

Scientific paper

The effect of local density of states (LDOS) fluctuations on the dynamics of a Kondo impurities in a small metallic point contact (PC) is studied. To estimate the spatial and energy dependent LDOS fluctuations we investigate a model PC by means of a transfer matrix formalism. For small PC's in the nanometer scale we find that near to the orifice strong LDOS fluctuations develop. These fluctuations may shift the Kondo temperature by several orders of magnitude, and result in a strong broadening of the PC Kondo peak in agreement with the results of recent measurements.

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