Scanning Tunneling Spectroscopy, Angle-resolved Photoemission Spectroscopy and Double-coil Mutual Inductance Investigation of Single Crystalline FeSe Superconductors

ORAL

Abstract

We report investigation of single crystalline FeSe superconductors by combining scanning tunneling microscopy/spectroscopy (STM/S), angle-resolved photoemission spectroscopy (ARPES) and double-coil mutual inductance measurement, which were all applied in-situ to a sample cleaved in an ultra-high-vacuum (UHV) chamber. Using STM/S, we clearly observed the 1×1 atomic topography and the superconducting gap of this single crystal. In addition, ARPES was used to measure the band dispersion of FeSe. Finally, using a home built double-coil mutual inductance system, operating in UHV, we measured its superfluid density. These measurements shed light on the origin of superconductivity in FeSe. Additionally, using FeSe as a superconducting platform, we are investigating the proximity effect with other 2D materials.

*Supported by Office of Naval Research(ONR), ONR-N00014-14-1-0330, National Science Foundation(NSF), DMR-1506678, Welch Foundation, F-1672.

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Presenters

  • Mengke Liu

    • Physics, Univ of Texas, Austin

Authors

  • Mengke Liu

    • Physics, Univ of Texas, Austin

  • Hyoungdo Nam

    • Physics, University of Texas at Austin
    • Physics, Univ of Texas, Austin
    • Department of Physics, Univ of Texas, Austin

  • Jiaqiang Yan

    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Ames Laboratory, Iowa State University

  • Jianshi Zhou

    • Univ of Texas
    • University of Texas
    • University of Texas at Austin
    • Texas Materials Institute, University of Texas at Austin
    • Univ of Texas, Austin
    • Mechanical Engineering, University of Texas at Austin
    • University of Texas, at Austin

  • Chih-Kang Shih

    • the University of Texas at Austin
    • Physics, University of Texas at Austin
    • Physics, Univ of Texas, Austin
    • Department of Physics, Univ of Texas, Austin
    • Physics, UT Austin
    • Univ of Texas, Austin