We have measured temperature-dependent resistivities of a set of Pb ultrathin films by repeating in situ deposition at liquid-He temperature. Observed conductance in the fermion region can be described by a single-parameter scaling function (β function) with a self-consistent theory for localization in two dimensions. Based on estimated values of electrical localization length (ξloc) and superconducting coherence length (ξₛᵤₚₑᵣ), the superconductor-insulator transition is confirmed to occur at the point where ξloc~2ξₛᵤₚₑᵣ. Moreover, only samples exhibiting lnT dependence in the fermion region become global coherent superconductors at low temperature.
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Kagawa et al. (1996) studied this question.
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