STM studies on FeSe<sub>x</sub>Te<sub>1-x </sub>thin films grown on Bi<sub>2</sub>Te<sub>3 </sub>single crystal

ORAL

Abstract

The iron-based superconductor FeSexTe1-x has attracted intensive interest for the fundamental understanding of unconventional superconductivity. Here we report nanoscale studies on FeSexTe1-x films on Bi2Te3 single crystal. Three different kinds of heterostructures: fully embedded monolayer; half-embedded monolayer; and top monolayer were studied systematically using Scanning Tunneling Microscopy/Spectroscopy (STM/STS). The studies show different superconducting behaviors for the three different monolayers. In the half-embedded monolayer, we find an identical statistical distribution of superconducting gaps with similar gap size values to the ones in the bulk. Furthermore, on Bi2Te3 surface, a proximitized gap is observed with a uniform distribution. If time permits, we will present our measurements of Fourier transform quasiparticle interference (QPI) for studying the order parameter.

*The work was supported by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4860 and NSF-DMREF program through Grants 1629382 and 1629068.

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Presenters

  • Guannan Chen

    • University of Illinois at Urbana-Champaign

Authors

  • Guannan Chen

    • University of Illinois at Urbana-Champaign

  • Lin Jiao

    • Max Planck Institute for Chemical Physics of Solids
    • University of Illinois at Urbana-Champaign

  • Jorge Olivares Rodriguez

    • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign
    • University of Illinois at Urbana-Champaign

  • Anuva Aishwarya

    • University of Illinois at Urbana-Champaign

  • Lianyang Dong

    • Materials Department, University of California, Santa Barbara

  • Stephen Wilson

    • University of California, Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials Engineering, University of California, Santa Barbara
    • California NanoSystems Institute/Materials, University of California, Santa Barbara

  • Vidya Madhavan

    • Physics, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign
    • Department of Physics, University of Illinois at Urbana-Champaign
    • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign