Publication: In operando evidence of deoxygenation in ionic liquid gating of YBa2Cu3O7-X
Loading...
Identifiers
Publication date
2017-01-10
Defense date
Advisors
Tutors
Journal Title
Journal ISSN
Volume Title
Publisher
National Academy of Sciences
Abstract
These results underscore the debate on the true nature, electrostatic vs. electrochemical, of the doping of cuprates with ionic liquids. Here, we address the doping mechanism of the high-temperature superconductor YBa2Cu3O7-X (YBCO) by simultaneous ionic liquid gating and X-ray absorption experiments. Pronounced spectral changes are observed at the Cu K-edge concomitant with the superconductor-to-insulator transition, evidencing modification of the Cu coordination resulting from the deoxygenation of the CuO chains, as confirmed by first-principles density functional theory (DFT) simulations. Beyond providing evidence of the importance of chemical doping in electric double-layer (EDL) gating experiments with superconducting cuprates, our work shows that interfacing correlated oxides with ionic liquids enables a delicate control of oxygen content, paving the way to novel electrochemical concepts in future oxide electronics.
Description
Keywords
Electric double-layer techniques, First-principles density functional theory, High-temperature superconductivity, Near-edge X-Ray absorption spectroscopies, Superconductor-insulator transition
Bibliographic citation
Perez-Muñoz, A. M., Schio, P., Poloni, R., Fernandez-Martinez, A., Rivera-Calzada, A., Cezar, J. C., Salas-Colera, E., Castro, G. R., Kinney, J., Leon, C., Santamaria, J., Garcia-Barriocanal, J. & Goldman, A. M. (2016). In operando evidence of deoxygenation in ionic liquid gating of YBa2Cu3O7-X. Proceedings of the National Academy of Sciences, 114(2), 215-220.