N. Bachar, S. Lerer, S. Hacohen-Gourgy, B. Almog, G. Deutscher
We show that transport properties of nano-scale granular Aluminum films near the metal to insulator transition are similar to those of Kondo systems. This similarity implies the existence of a spin-flip scattering mechanism related to the small grain size. We propose that a shell electronic structure in at least a fraction of the grains may be at the origin of this mechanism. Degenerate states of this shell structure may also contribute to an elevated superconducting critical temperature.
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http://arxiv.org/abs/1207.0970
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