Superconductivity and Strain Effects in Quantum Paraelectric STO

ORAL

Abstract

We will present our results on investigation of the origin of superconductivity in doped STO using a combination of density functional and strong coupling theories[1]. Our approach suggests a model in which the ferroelectric soft mode fluctuations provide the pairing interaction for superconducting carriers. Based on this model, we made a prediction that superconducting Tc will increase with increasing 18O isotope substitution, a scenario that is experimentally verifiable. We now discuss a proposal to use strain as another tool to control the paraelectric fluctuations and thus control superconductivity in STO[2].

[1]J. Edge et al Phys. Rev. Lett. 115, 247002 (2015),
[2] K. Dunnett, et.al, in preparation,

*Swedish Research Council Grant No. 638-2013-9243; Villum foundation; Knut and Alice Wallenberg Foundation; European Research Council Grant Agreement No. DM-321031.

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Presenters

  • Kirsty Dunnett

    • Nordita
    • NORDITA

Authors

  • Kirsty Dunnett

    • Nordita
    • NORDITA

  • Awadhesh Narayan

    • ETH Zurich
    • School of Physics, CRANN and AMBER, Trinity College

  • Nicola Spaldin

    • Materials Theory, ETH Zurich
    • Materials Theory, ETH
    • ETH - Zurich
    • ETH Zurich
    • Material Theory, ETH - Zurich

  • Alexander Balatsky

    • NORDITA
    • Institute for Materials Science, Los Alamos National Laboratory
    • Nordita
    • Los Alamos Natl Lab
    • Nordita, KTH Royal Institute of Technology and Stockholm University; Institute for Materials Science, Los Alamos National Laboratory; Department of Physics, University of Conn
    • Instittute for Materials Science, Los Alamos National Laboratory
    • Institute for Materials Science, Los Alamos National Laboratory/Nordita/University of Connecticut