STM studies on FeSexTe1-x thin films grown on Bi2Te3 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.

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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