Kondo Effect in Systems with Spin Disorder

Details Kondo Effect in Systems with Spin Disorder Kondo Effect in Systems with Spin Disorder

1999-06-21

arxiv.org/abs/cond-mat/9906324v1

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages, 5 figures, REVTeX

Scientific paper

10.1103/PhysRevB.60.9675

We consider the role of static disorder in the spin sector of the one- and two-channel Kondo models. The distribution functions of the disorder-induced effective energy splitting between the two levels of the Kondo impurity are derived to the lowest order in the concentration of static scatterers. It is demonstrated that the distribution functions are strongly asymmetric, with the typical splitting being parametrically smaller than the average rms value. We employ the derived distribution function of splittings to study the temperature dependence of the low-temperature conductance of a sample containing an ensemble of two-channel Kondo impurities. The results are used to analyze the consistency of the two-channel Kondo interpretation of the zero-bias anomalies observed in Cu/(Si:N)/Cu nanoconstrictions.

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