Ferroionic generation of superconductivity in a non-superconducting cuprate

ORAL

Abstract


We have studied ferroelectric tunnel junctions with La0.7Sr0.3MnO3 (LSMO) bottom electrode, a ferroelectric (FE) BaTiO3 barrier and La5SrCu6O15 (LSCO) top electrode. Here, migration of oxygen atoms is triggered by the large strain modulations building up at the junction interfaces combined with the strong electric field produced at moderate applied voltages. We show that this mechanism can stabilize a superconducting phase at the interface between a ferroelectric and a non-superconducting cuprate. As probed by tunneling conductance, such phase is characterized by a 22 meV superconducting gap and a critical temperature TC as high as 70 K, as well as by spectral features specific of d-wave superconductors such as YBa2Cu3O7. Furthermore, we show that ferroelectric switching modulates the superconducting gap, which implies the that coupling between ferroelectric polarization and the ionization of oxygen vacancies controls the interfacial phase doping. This ferroionic route appears as promising new strategy to explore phase diagrams at doping levels far beyond the ones reached with field effect or ionic liquid doping.

*Project Quantox of QuantERA ERA-NET Cofund in Quantum Technologies (Grant Agreement 731473) European Union’s Horizon 2020 Programme.
Spanish MINECO grant MAT2017-87134-C02

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Presenters

  • Fernando Gallego

    • Universidad Complutense de Madrid
    • Unité Mixte de Physique, CNRS/Thales
    • 2D Foundry, Instituto de Ciencia de Materiales de Madrid

Authors

  • Fernando Gallego

    • Universidad Complutense de Madrid
    • Unité Mixte de Physique, CNRS/Thales
    • 2D Foundry, Instituto de Ciencia de Materiales de Madrid

  • Kevin Seurre

    • Unité Mixte de Physique, CNRS/Thales
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France

  • Mariona Cabero

    • Dept. de Fisica de Materiales & Instituto Pluridisciplinar, Universidad Complutense de Madrid
    • Centro Nacional de Microscopía Electrónica, Universidad Complutense de Madrid
    • IMDEA Nanoscience

  • Victor Rouco

    • Física de Materiales, GFMC, Universidad Complutense de Madrid
    • Universidad Complutense de Madrid
    • Física de Materiales, Universidad Complutense de Madrid

  • Anke Sander

    • CNRS/THALES
    • Unité Mixte de Physique CNRS/Thales
    • Unité Mixte de Physique CNRS/Thales, Universite Paris-Saclay
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
    • Unité Mixte de Physique, CNRS/Thales
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France

  • Fabian Cuellar

    • Universidad Complutense de Madrid
    • Física de Materiales, Universidad Complutense de Madrid

  • Javier Tornos

    • Universidad Complutense de Madrid
    • Física de Materiales, Universidad Complutense de Madrid

  • David Hernandez-Martin

    • Física de Materiales, Universidad Complutense de Madrid

  • Zouhair Sefrioui

    • Física de Materiales, Universidad Complutense de Madrid

  • Alberto Rivera

    • Universidad Complutense de Madrid
    • Departamento de Física de Materiales, Universidad Complutense de Madrid
    • Física de Materiales, Universidad Complutense de Madrid

  • Maria Varela

    • Dept. de Fisica de Materiales & Instituto Pluridisciplinar, Universidad Complutense de Madrid
    • Física de Materiales, Universidad Complutense de Madrid

  • Mar Garcia Hernandez

    • Instituto de Ciencia de Materiales de Madrid, CSIC
    • 2D Foundry, Instituto de Ciencia de Materiales de Madrid

  • Federico Mompean

    • Instituto de Ciencia de Materiales de Madrid, CSIC
    • 2D Foundry, Instituto de Ciencia de Materiales de Madrid

  • Jose Maria Gonzalez-Calbet

    • Centro Nacional de Microscopía Electrónica, Universidad Complutense de Madrid
    • Centro Nacional de Microscopia Electronica. Universidad Complutense

  • Javier E Villegas

    • CNRS/THALES
    • Unité Mixte de Physique CNRS/Thales
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
    • Unité Mixte de Physique, CNRS/Thales
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France

  • Carlos Leon

    • Universidad Complutense de Madrid
    • Física de Materiales, Universidad Complutense de Madrid

  • Jacobo Santamaria

    • Física de Materiales, GFMC, Universidad Complutense de Madrid
    • Universidad Complutense de Madrid
    • GFMC, Universidad Complutense de Madrid
    • Grupo de Física de Materiales Complejos, Dpt. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain
    • Física de Materiales, Universidad Complutense de Madrid