Two-Dimensional Electrical Conductivity in Quench-Condensed Metal Films
- 13 February 1978
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 40 (7) , 479-482
- https://doi.org/10.1103/physrevlett.40.479
Abstract
The resistance of ultrathin films condensed on low-temperature substrates has been measured. All of the materials studied (Au, Cu, Al, Sn, and Pb) show a transition from activated to metallic behavior as the resistance is reduced below 30 000 Ω/□. This result gives strong evidence in support of the concept of a minimum two-dimensional conductivity. In Pb films with resistance >30 000 Ω/□, the onset of superconductivity is marked by an increase in activation energy.Keywords
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