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A strong disorder characterized by a small product of the Fermi vector kF andthe electron mean free l drives superconductors towards insulating state. Suchdisorder can be introduced by making the films very thin. Here, we present 3-nmMo2N film with k_F*l ~ 2 with a resistive superconducting transitiontemperature Tc = 2 K heavily suppressed in comparison with the bulk Tc.Superconducting density of states (DOS) with smeared gap-like peaks and in-gapstates, so called Dynes DOS, is observed by the low temperature tunnelingspectroscopy despite a sharp resistive transition. By scanning tunnelingmicroscope the spectral maps are obtained and related to the surfacetopography. The maps show a spatial variation of the superconducting energy gapon the order of 20 % which is not accidental but well correlates with thesurface corrugation: protrusions reveal larger gap, smaller spectral smearingand smaller in-gap states. In agreement with our previous measurements onultrathin MoC films we suggest that the film-substrate interface introducingthe local pair-breaking is responsible for the observed effects and generallyfor the suppression of the superconductivity in these ultrathin films.

Suppressed superconductivity in ultrathin Mo2N films due to pair-breaking at the interface