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A reentrant temperature dependence of the thermoresistivity$\rho_{\mathrm{xx}}(T)$ between an onset local superconducting orderingtemperature $T_\mathrm{loc}^\mathrm{onset}$ and a global superconductingtransition at $T=T_\mathrm{glo}^\mathrm{offset}$ has been reported indisordered conventional 3-dimensional (3D) superconductors. The disorder ofthese superconductors is a result of either an extrinsic granularity due tograin boundaries, or of an intrinsic granularity ascribable to the electronicdisorder originating from impurity dopants. Here, the effects of Fe doping onthe electronic properties of sputtered NbN layers with a nominal thickness of100 nm are studied by means of low-$T$/high-$\mu_{0}H$ magnetotransportmeasurements. The doping of NbN is achieved $via$ implantation of 35 keV Feions. In the as-grown NbN films, a local onset of superconductivity at$T_\mathrm{loc}^\mathrm{onset}=15.72\,\mathrm{K}$ is found, while the globalsuperconducting ordering is achieved at$T_\mathrm{glo}^\mathrm{offset}=15.05\,\mathrm{K}$, with a normal stateresistivity $\rho_{\mathrm{xx}}=22\,{\mu\Omega}\cdot{\mathrm{cm}}$. Moreover,upon Fe doping of NbN, $\rho_{\mathrm{xx}}=40\,{\mu\Omega}\cdot{\mathrm{cm}}$is estimated, while $T_\mathrm{loc}^\mathrm{onset}$ and$T_\mathrm{glo}^\mathrm{offset}$ are measured to be 15.1 K and 13.5K,respectively. In Fe:NbN, the intrinsic granularity leads to the emergence of abosonic insulator state and the normal-metal-to-superconductor transition isaccompanied by six different electronic phases characterized by a $N$-shaped$T$ dependence of $\rho_{\mathrm{xx}}(T)$. The bosonic insulator state in a$s$-wave conventional superconductor doped with dilute paramagnetic impuritiesis predicted to represent a workbench for emergent phenomena, such as gaplesssuperconductivity, triplet Cooper pairings and topological odd frequencysuperconductivity.

Effect of impurity scattering on percolation of bosonic islands and reentrant superconductivity in Fe implanted NbN thin films