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Superconducting Transition Temperature Modulation in NbN via EDL Gating

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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 na¨ıve screening model.

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Authors and Affiliations

  1. Department of Applied Science and Technology, Politecnico di Torino, Torino, Italy

    E. Piatti, A. Sola, D. Daghero, G. A. Ummarino, F. Laviano, J. R. Nair, C. Gerbaldi & R. S. Gonnelli

  2. CNR-SPIN Institute of Superconductors, Innovative Materials and Devices, UOS-Napoli, Napoli, Italy

    R. Cristiano

  3. School of Engineering, University of Glasgow, Glasgow, UK

    A. Casaburi

  4. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moskva, Russia

    G. A. Ummarino

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  1. E. Piatti
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  2. A. Sola
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  3. D. Daghero
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  4. G. A. Ummarino
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  5. F. Laviano
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  6. J. R. Nair
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  7. C. Gerbaldi
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  8. R. Cristiano
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  9. A. Casaburi
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  10. R. S. Gonnelli
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Correspondence to D. Daghero.

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Piatti, E., Sola, A., Daghero, D. et al. Superconducting Transition Temperature Modulation in NbN via EDL Gating. J Supercond Nov Magn 29, 587–591 (2016). https://doi.org/10.1007/s10948-015-3306-0

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  • DOI: https://doi.org/10.1007/s10948-015-3306-0

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