Superconductivity of ultrathin beryllium films in the strong-localization state

The effect of a magnetic field on the resistance of cold deposited beryllium films 6–10 Å thick has been investigated. In films about 10 Å thick, which are in the state of strong localization (R□ = 105 Ω), a local superconductivity has been discovered. It is caused by disordered (to various degree according to reduced Tc values) crystallites of the metastable superconducting phase of beryllium. Data of this report, along with those previously obtained, give evidence that the metastable superconducting phase of beryllium occurs as a result of phase size effect in a narrow interval of grain sizes (8–30 Å).

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