Abstract
Electric resistivity measurements in nanocrystalline Cu-samples alloyed with Fe in the concentration regime of CFe ∼ 0.17 - 0.37 at - % and nanocrystallite sizes of 6 nm to 24 nm show a Kondo minimum at ∼ 30 K. Resistivity does not saturate at low temperature but passes over a maximum at ∼ 10 K, which may be due to a spin glass transition. An applied magnetic field of 0.5T shifts the minimum to lower T, but does not destroy the maximum. The curves measured are rather spiky in contrast to curves obtained from polycrystalline samples which is possibly due to non-selfaveraging effects. Further indication for such effects is a non-monotonuous dependence of the resistivity minimum as a function of average crystallite size.
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