Electrostatic tuning of the electrical properties of YBa2Cu3O7−x using an ionic liquid X. Leng, J. Garcia-Barriocanal, J. Kinney, B. Yang, Y. Lee and A.M. Goldman Eur. Phys. J. Special Topics, 222 5 (2013) 1203-1215 Published online: 15 July 2013 DOI: 10.1140/epjst/e2013-01915-y