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We show that the normal state transport properties of nano-scale granularAluminum films, near the metal to insulator transition, present strikingsimilarities with those of Kondo systems. Those include a negativemagneto-resistance, a minimum of resistance R at a temperature Tm in metallicfilms, a logarithmic rise at low temperatures and a negative curvature of R(T)at high temperatures. These normal state properties are interpreted in terms ofspin-flip scattering of conduction electrons by local magnetic moments,possibly located at the metal/oxide interfaces. Their co-existence with theenhanced superconductivity seen in these films is discussed.

Kondo-like behavior near the metal-to-insulator transition of nano-scale granular aluminum