Kondo effect in one-dimensional Au(Fe)

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Abstract
We have investigated dimensional crossover with regards to the Kondo effect in Au doped with small amounts of Fe [Au(Fe)]. The samples were narrow strips, and had a constant thickness (≊150 Å) that was much smaller than their width. When the strip width w was very large, we found a contribution to the resistance from the presence of the Fe, which we identify as due to the Kondo effect. As w was reduced below about 1500 Å this Kondo contribution to the resistivity decreased significantly. This behavior is similar to that found in previous studies of the three- to two-dimensional Kondo crossover, and implies that there is an intrinsic length scale of ∼1500 Å for the Kondo effect in Au(Fe). These results are discussed in light of recent theoretical work.

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