Mapping the superfluid density in an Iron-based Superconductor

ORAL

Abstract

Cooper pairs can tunnel through the vacuum barrier between two superconducting electrodes, known as a Josephson junction. Depending on the properties of the junction and the environment, one can extract the superconducting order parameter from the current-voltage spectra. Here, I will present the Josephson tunneling spectroscopic results of an unconventional Fe-based superconductor acquired with a superconducting STM tip. We demonstrate the Josephson tunneling induced characteristic current-voltage curves close to zero bias on a Pb(111) surface and a Fe-based superconductor. I will discuss the spatial variations of the superfluid density in this correlated superconductor and reveal their correlation with an inhomogeneous quasiparticle density of states.

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Presenters

  • Doohee Cho

    • Leiden University

Authors

  • Doohee Cho

    • Leiden University

  • Koen Bastiaans

    • Leiden University

  • Damianos Chatzopoulos

    • Leiden University

  • Genda Gu

    • Brookhaven National Laboratory
    • Brookhaven National Lab
    • Department of Condensed Matter Physics and Materials Science, Brookhaven, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
    • Cond. Matt. Physics and Material Science, Brookhaven Natl Lab
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory
    • Brookhaven National Labs, Long Island, NY, USA, 11973
    • Condensed Matter Physics & Materials Science, Brookhaven National Laboratory
    • Condensed Matter Physics, Brookhaven National Laboratory
    • Brookhaven National Laboratories
    • Chinese Academy of Sciences
    • Condensed Matter Physics & Materials Science, Brookhaven National Lab
    • Brookhaven Natl Lab

  • Milan P Allan

    • Leiden University