Electrical conductivity of metal microcontacts containing magnetic impurities

This study deals with the effect of electron scattering by impurities with localized magnetic moments on the electrical conductivity of a metal microcontact. It is demonstrated that the second derivative of the current with respect to the voltage (microcontact spectrum) contains a nonlinearity in the low-voltage range eV ∼ T (zero bias anomalies). The sign of a zero bias anomaly is determined by the sign of the exchange integral J.

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