Superconducting transition temperature modulation in NbN via EDL gating

Piatti, E., Sola, A., Daghero, D., Ummarino, G.A., Laviano, F., Nair, J.R., Gerbaldi, C., Cristiano, R., Casaburi, A. and Gonnelli, R.S. (2016) Superconducting transition temperature modulation in NbN via EDL gating. Journal of Superconductivity and Novel Magnetism, 29(3), pp. 587-591. (doi:10.1007/s10948-015-3306-0)

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Abstract

We perform electric double-layer gating experiments on thin films of niobium nitride. Thanks to a cross-linked polymer electrolyte system of improved efficiency, we induce surface charge densities as high as ≈ 2.8 × 1015cm−2 in the active channel of the devices. We report a reversible modulation of the superconducting transition temperature (either positive or negative depending on the sign of the gate voltage) whose magnitude and sign are incompatible with the confinement of the perturbed superconducting state to a thin surface layer, as would be expected within a naıve screening model.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Casaburi, Dr Alessandro
Authors: Piatti, E., Sola, A., Daghero, D., Ummarino, G.A., Laviano, F., Nair, J.R., Gerbaldi, C., Cristiano, R., Casaburi, A., and Gonnelli, R.S.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Superconductivity and Novel Magnetism
Publisher:Springer US
ISSN:1557-1939
ISSN (Online):1557-1947
Published Online:14 December 2015
Copyright Holders:Copyright © 2015 Springer US
First Published:First published in Journal of Superconductivity and Novel Magnetism 29(3):587-591
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.

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