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.
- Received 5 April 2011
- Publisher error corrected 8 July 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.027001
© 2011 American Physical Society
Corrections
8 July 2011