Kondo Effect in Systems with Spin Disorder

Abstract

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.

16 pages, 5 figures, REVTeX

Cited by in corpus (5)

• Kondo Temperature for the Two-Channel Kondo Models of Tunneling Centers
• Thermodynamics of the anisotropic two-channel Kondo problem
• Existence of two-channel Kondo regime for tunneling impurities with resonant scattering
• Non-existence of strong coupling two-channel Kondo fixed point for microscopic models of tunneling centers
• Kondo effect in mesoscopic systems