Suppression of superconductivity and the magnetotransport behaviour in ultra-thin flakes of FeSe

ORAL

Abstract

The discovery of high temperature superconductivity in a monolayer of FeSe on SrTiO3 has ignited significant interest in understanding its two-dimensional superconductivity and the interfacial phenomena that determine its properties. To address these aspects, we examine the superconducting and electronic properties of exfoliated thin flakes of FeSe as a function of decreasing thickness, from bulk down towards 10 nm. We present a magnetotransport study in magnetic fields up to 38 T, which allows us to assess the changes in the multi-band electronic properties as a function of thickness. By reducing the thickness, the superconductivity of FeSe flakes is suppressed and the superconducting phase diagrams show significant changes in anisotropy.

*The research was supported by the Oxford Centre for Applied Superconductivity (CFAS), the John Fell Fund of the Oxford University and by EPSRC, UK (EP/L015544, EP/M020517/1, EP/I004475/1).

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Presenters

  • Liam Farrar

    • Department of Physics, University of Bath

Authors

  • Liam Farrar

    • Department of Physics, University of Bath

  • Matthew Bristow

    • Department of Physics, University of Oxford

  • Amir Haghighirad

    • Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
    • Institute for Solid-State Physics, Karlsruhe Institute of Technology
    • Institute for Solid State Physics, Karlsruhe Institute of Technology

  • Alix McCollam

    • High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
    • High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED, Nijmegen, The Netherlands
    • High Field Magnet Laboratory (HFML-EMFL), Radboud University

  • Simon Bending

    • University of Bath
    • Department of Physics, University of Bath

  • Amalia Coldea

    • Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, U.K
    • Department of Physics, University of Oxford