Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.067004
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Funding
- National Science Foundation [NSF/DMR-0709584, 0854752]
- University of Minnesota
- NSF through the NNIN
- Spanish Ministry of Education
- National Program of Mobility of Human Resources
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0854752] Funding Source: National Science Foundation
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We successfully tuned an underdoped ultrathin YBa2Cu3O7-x film into the overdoped regime by means of electrostatic doping using an ionic liquid as a dielectric material. This process proved to be reversible. Transport measurements showed a series of anomalous features compared to chemically doped bulk samples and a different two-step doping mechanism for electrostatic doping was revealed. The normal resistance increased with carrier concentration on the overdoped side and the high temperature (180 K) Hall number peaked at a doping level of p similar to 0.15. These anomalous behaviors suggest that there is an electronic phase transition in the Fermi surface around the optimal doping level.
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