Effect of localized electron states on superconductivity of ultrathin beryllium films

A wide spectrum of distortions is induced in ultrathin beryllium films of thickness less than 10 A, which are responsible for the system transition from the strong localization state completely suppressing superconductivity (in this case R□ of the layer reaches 97600 Ohm) to the weak localization stae coexisting with superconductivity at comparatively high Tc (5 K). The resistance per square R□ of the films decreases more than by an order of magnitude. The superconductivity with Tc=1.7 K occurs at rather strong localization, when R□ of the layer is 34000 Ohm