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Indications of an electronic phase transition in two-dimensional superconducting YBa2Cu3O(7-x) thin films induced by
Xiang Leng1, Javier Garcia-Barriocanal, Boyi Yang
1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Abstract:
We successfully tuned an underdoped ultrathin YBa2Cu3O(7-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∼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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