Abstract

Measurements of the magnetic scattering time in very thin Cu films (thickness $t\ensuremath{\simeq}5$ nm), homogeneously doped with magnetic Cr atoms (concentration \ensuremath{\lesssim}100 ppm), are reported. The weak electron localization causes an anomalous magnetoresistance which is very sensitive to the spin-flip scattering of the conduction electrons. The maximum in the temperature dependence of the spin-flip scattering rate is in excellent agreement with the Suhl-Nagaoka approximation for the resonant Kondo scattering in the vicinity of the Kondo temperature ${T}_{\mathrm{K}}\ensuremath{\simeq}2$ K.

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