Discovery of superconductivity in KTaO3 by electrostatic carrier doping (2024)

Table of Contents
Subjects Abstract Access options Additional access options: Similar content being viewed by others Tunable superconductivity and its origin at KTaO3 interfaces Superfluid stiffness of a KTaO3-based two-dimensional electron gas Transport behaviors of topological band conduction in KTaO3’s two-dimensional electron gases References Acknowledgements Author information Authors and Affiliations Contributions Corresponding author Ethics declarations Competing interests Supplementary information Supplementary information Rights and permissions About this article Cite this article This article is cited by Bending tailored conducting behavior in freestanding La0.67Sr0.33MnO3 (LSMO) film Tunable superconductivity and its origin at KTaO3 interfaces Spontaneous rotational symmetry breaking in KTaO3 heterointerface superconductors Review of the role of ionic liquids in two-dimensional materials Electrostatic gating and intercalation in 2D materials Associated content Superconductivity at the double References
  • Letter
  • Published:
  • K. Ueno1,2,
  • S. Nakamura3,4,
  • H. Shimotani5,
  • H. T. Yuan5,
  • N. Kimura4,6,
  • T. Nojima3,4,
  • H. Aoki4,6,
  • Y. Iwasa5,7 &
  • …
  • M. Kawasaki1,5,7

Nature Nanotechnology volume6,pages 408–412 (2011)Cite this article

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Subjects

  • Electronic properties and materials
  • Superconducting devices

Abstract

Superconductivity at interfaces has been investigated since the first demonstration of electric-field-tunable superconductivity in ultrathin films in 19601. So far, research on interface superconductivity has focused on materials that are known to be superconductors in bulk1,2,3,4,5,6,7,8,9. Here, we show that electrostatic carrier doping can induce superconductivity in KTaO3, a material in which superconductivity has not been observed before10,11. Taking advantage of the large capacitance of the self-organized electric double layer that forms at the interface between an ionic liquid and KTaO3 (ref.12), we achieve a charge carrier density that is an order of magnitude larger than the density that can be achieved with conventional chemical doping. Superconductivity emerges in KTaO3 at 50mK for two-dimensional carrier densities in the range 2.3×1014 to 3.7×1014cm−2. The present result clearly shows that electrostatic carrier doping can lead to new states of matter at nanoscale interfaces.

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Discovery of superconductivity in KTaO3 by electrostatic carrier doping (1)
Discovery of superconductivity in KTaO3 by electrostatic carrier doping (2)
Discovery of superconductivity in KTaO3 by electrostatic carrier doping (3)
Discovery of superconductivity in KTaO3 by electrostatic carrier doping (4)
Discovery of superconductivity in KTaO3 by electrostatic carrier doping (5)

Similar content being viewed by others

Discovery of superconductivity in KTaO3 by electrostatic carrier doping (6)

Tunable superconductivity and its origin at KTaO3 interfaces

Article Open access 20 February 2023

Discovery of superconductivity in KTaO3 by electrostatic carrier doping (8)

Transport behaviors of topological band conduction in KTaO3’s two-dimensional electron gases

Article Open access 29 December 2022

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    See Also
    Large electric-field-induced strain in ferroelectric crystals by point-defect-mediated reversible domain switching

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Acknowledgements

This work was partly supported by Grants-in-Aid for Scientific Research (21686002, 21224009 and 21654046) and an Innovative Area grant on ‘Topological Quantum Phenomena’ from the Ministry of Education, Culture, Sport, Science and Technology of Japan. This work was also partly supported by Asahi Glass Foundation and the Nippon Sheet Glass Foundation for Materials Science and Engineering.

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Authors and Affiliations

  1. WPI Advanced Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan

    K. Ueno&M. Kawasaki

  2. PRESTO, Japan Science and Technology Agency, Tokyo, 102-0075, Japan

    K. Ueno

  3. Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan

    S. Nakamura&T. Nojima

  4. Center for Low Temperature Science, Tohoku University, Sendai, 980-8577, Japan

    S. Nakamura,N. Kimura,T. Nojima&H. Aoki

  5. Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan

    H. Shimotani,H. T. Yuan,Y. Iwasa&M. Kawasaki

  6. Department of Physics, Tohoku University, Sendai, 980-8578, Japan

    N. Kimura&H. Aoki

  7. CREST, Japan Science and Technology Agency, Tokyo, 102-0075, Japan

    Y. Iwasa&M. Kawasaki

Authors

  1. K. Ueno

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  2. S. Nakamura

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  3. H. Shimotani

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  4. H. T. Yuan

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  5. N. Kimura

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  6. T. Nojima

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  7. H. Aoki

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  8. Y. Iwasa

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  9. M. Kawasaki

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Contributions

K.U. performed planning, sample fabrication, measurements and analysis. S.N., N.K., T.N. and H.A. assisted with cryogenic transport measurements. H.S. and H.T.Y. assisted with planning. Y.I. and M.K. performed planning and analysis.

Corresponding author

Correspondence to M. Kawasaki.

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The authors declare no competing financial interests.

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Ueno, K., Nakamura, S., Shimotani, H. et al. Discovery of superconductivity in KTaO3 by electrostatic carrier doping. Nature Nanotech 6, 408–412 (2011). https://doi.org/10.1038/nnano.2011.78

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