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Superconductor-insulator transition (SIT) driven by disorder and transversemagnetic field has been investigated in ultrathin MoN films by means oftransport measurements and scanning tunneling microscopy and spectroscopy. Upondecreasing thickness, the homogeneously disordered films show increasing sheetresistance Rs, shift of the superconducting transition Tc to lower temperatureswith the 3 nm MoN being the last superconducting film and thinner films alreadyinsulating. Fermionic scenario of SIT is evidenced by applicability of theFinkelsteins model, by the fact that Tc and the superconducting gap are coupledwith a constant ratio, and by the spatial homogeneity of the superconductingand electronic characteristics. The logarithmic anomaly found in the tunnelingspectra of the non-superconducting films is further enhanced in increasedmagnetic field due to the Zeeman spin effects driving the system deeper intothe insulating state and pointing also to fermionic SIT.

Disorder- and magnetic field-tuned fermionic superconductor-insulator transition in MoN thin films. Transport and STM studies