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Superconducting properties change in confined geometries. Here we study theeffects of strong confinement in nanosized Pb-islands on Si(111) 7x7. Smallhexagonal islands with diameters less than 50 nm and a uniform height of 7atomic layers are formed by depositing Pb at low temperature and annealing at300 K. We measure the tunneling spectra of individual Pb-nanoislands using alow-temperature scanning tunneling microscope operated at 0.6 K, and follow thenarrowing of the superconducting gap as a function of magnetic field. We findthe critical magnetic field, at which the superconducting gap vanishes, reachesseveral Tesla, which represents a greater than 50-fold enhancement compared tothe bulk value. By independently measuring the size of the superconducting gap,and the critical magnetic field that quenches superconductivity for a range ofnanoislands we can correlate these two fundamental parameters and estimate themaximal achievable critical field for 7 ML Pb-nanoislands to 7 T.

Closing the superconducting gap in small Pb-nanoislands with high magnetic fields