Superconductor-insulator transition in ultrathin Pb films: Localization and superconducting coherence

K. Kagawa; K. Inagaki; S. Tanda

doi:10.1103/PhysRevB.53.R2979

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Superconductor-insulator transition in ultrathin Pb films: Localization and superconducting coherence

K. Kagawa, K. Inagaki, S. Tanda

DOI 10.1103/PhysRevB.53.R2979 · Physical Review B

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.5	Pressure not reported	onset