Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.027001
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Funding
- National Science Foundation [NSF/DMR-0709584]
- NSF through the NNIN
- Spanish Ministry of Education
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0854752] Funding Source: National Science Foundation
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The electrical transport properties of ultrathin YBa2Cu3O7-x 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, R(T), 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.
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