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Superconducting nanofilms are tunable systems that can host a 3D-2Ddimensional crossover, leading to the Berezinskii-Kosterlitz-Thouless (BKT)superconducting transition approaching the 2D regime. Reducing further thedimensionality, from 2D to quasi-1D, superconducting nanostructures withdisorder can generate quantum and thermal phase slips (PS) of the orderparameter. Both BKT and PS are complex phase fluctuation phenomena of difficultexperimental detection. Here, we have characterized superconducting NbNnanofilms thinner than 15 nm, on different substrates, by temperature dependentresistivity and current-voltage (I-V) characteristics. Our measurements haveevidenced clear features related to the emergence of BKT transition and PSevents. The contemporary observation in the same system of BKT transition andPS events and their tunable evolution in temperature and thickness, has beenexplained as due to the nano-conducting paths forming in a granular NbN system.In one of the investigated samples we have been able to trace and characterizethe continuous evolution in temperature from quantum to thermal PS. Ouranalysis has established that the detected complex phase phenomena are stronglyrelated to the interplay between the typical size of the nano-conductive pathsand the superconducting coherence length.

Complex phase-fluctuation effects correlated with granularity in superconducting NbN nanofilms