Unconventional magnetic field effect on noise properties of AlOx thin films in Kondo-like transport regime

Granular aluminum oxide is an interesting material for application in quantum circuits. However, several issues regarding its normal state transport properties are still open. Here, detailed DC and noise transport measurements have been performed on thin films of granular Al oxide. The results evidence the presence of a Kondo-type resistivity increase at low temperatures, where specific excess 1/f noise is observed. The magnetic dependence of the excess noise further strengthens its connection with the Kondo mechanism. © 2019, EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature.