Indications of an electronic phase transition in two-dimensional superconducting YBa 2Cu 3O 7-x thin films induced by electrostatic doping

Xiang Leng, Javier Garcia-Barriocanal, Boyi Yang, Yeonbae Lee, J. Kinney, A. M. Goldman

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31 Scopus citations

Abstract

We successfully tuned an underdoped ultrathin YBa 2Cu 3O 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.

Original languageEnglish (US)
Article number067004
JournalPhysical review letters
Volume108
Issue number6
DOIs
StatePublished - Feb 10 2012

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