Uniaxial strain effect on superconductivity in 1D and 2D LaAlO<sub>3</sub>/SrTiO<sub>3</sub> channels

ORAL

Abstract

We investigate the effects of uniaxial strain on superconductivity of nanowires in LaAlO3/SrTiO3. The interface of LaAlO3 and SrTiO3 has a high-mobility 2D electron gas which can be superconducting at sub-Kelvin temperatures. We are able to create 1D conducting channels at the interface using conductive atomic force microscope lithography [1]. Superconductivity in the system is associated with ferroelastic domain boundaries [2] and therefore is in 1D regimes. Application of an external uniaxial stress is expected to displace the ferroelastic domain boundaries. Our experiments indicate that uniaxial stretching of the nanowire in the parallel direction completely suppress the superconducting state, while reversal of the applied strain restores superconductivity. We will discuss implications of possible electron-pairing mechanism in the 1D superconductor.
[1] C. Cen, et al., Nature Materials 7, 298 (2008).
[2] Y.-Y. Pai et al., Phys Rev Lett 120, 147001 (2018).

*JL acknowledges a Vannevar Bush Faculty Fellowship (ONR N00014-15-1-2847), and the Office of Naval Research (N00014-16-1-3152). The work at University of Wisconsin-Madison was supported by the National Science Foundation under DMREF Grant No. DMR-1629270, AFOSR FA9550-15-1-0334 and AOARD FA2386-15-1-4046.

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Presenters

  • Xinyi Wu

    • Univ of Pittsburgh

Authors

  • Xinyi Wu

    • Univ of Pittsburgh

  • Megan Briggeman

    • Univ of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh
    • Physics and Astronomy, University of Pittsburgh

  • Joseph Albro

    • Univ of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh

  • Jianan Li

    • Univ of Pittsburgh
    • Physics & Astronomy, University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh
    • Physics and Astronomy, University of Pittsburgh

  • Jung-Woo Lee

    • Univ of Wisconsin-Madison
    • Materials Science and Engineering, University of Wisconsin-Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin–Madison
    • Department of Materials Science and Engineering, University of Wisconsin at Madison

  • Hyungwoo Lee

    • Univ of Wisconsin-Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison

  • Chang-Beom Eom

    • Univ of Wisconsin-Madison
    • Materials Science and Engineering, University of Wisconsin-Madison
    • University of Wisconsin–Madison
    • Department of Materials Science and Engineering, University of Wisconsin-Madison
    • Materials Science & Engineering, University of Wisconsin-Madison
    • University of Wisconsin - Madison
    • Department of Materials Science and Engineering, University of Wisconsin - Madison
    • Department of Materials Science and Engineering, University of Wisconsin at Madison

  • Patrick Irvin

    • Univ of Pittsburgh
    • Physics & Astronomy, University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh
    • Physics and Astronomy, University of Pittsburgh

  • Jeremy Levy

    • Univ of Pittsburgh
    • Physics & Astronomy, University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh
    • Physics and Astronomy, University of Pittsburgh