Electrostatic Control of the Evolution from a Superconducting Phase to an Insulating Phase in UltrathinFilms
Open Access
- 7 July 2011
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 107 (2), 027001
- https://doi.org/10.1103/physrevlett.107.027001
Abstract
The electrical transport properties of ultrathin films have been modified using an electric double layer transistor configuration employing an ionic liquid. A clear evolution from superconductor to insulator was observed in nominally 7 unit-cell-thick films. Using a finite size scaling analysis, curves of resistance versus temperature, , over the temperature range from 6 to 22 K were found to collapse onto a single scaling function, which suggests the presence of a quantum critical point. However, the scaling fails at the lowest temperatures indicating the possible presence of an additional phase between the superconducting and insulating regimes.
Funding Information
- National Science Foundation
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