Quantum imaging of an Fe-Chalcogenide topological superconductor

ORAL

Abstract

The family of Fe-chalcogenide superconductors FeTexSe1-x possess intrinsic topological band structure, high-temperature superconductivity, and unconventional pairing symmetry, promising to develop novel, quantum-based computing strategies with improved information processing speeds and energy efficiency. To date, the magnetic properties of FeTexSe1-x have remained largely unexplored, which prevents a comprehensive understanding of their underlying material properties. Exploiting nitrogen-vacancy (NV) centers in diamond, we have performed nanoscale quantum sensing and imaging of magnetic flux generated by exfoliated FeTe0.7Se0.3 flakes, demonstrating the strong correlation between superconductivity and emergence of ferromagnetism in FeTe0.7Se0.3. The coexistence of superconductivity and ferromagnetism in an established topological superconductor provides new opportunities for exploring exotic spin and charge transport behaviors in quantum materials.

*Air Force Office of Scientific Research under award FA9550-20-1-0319 and its Young Investigator Program under award FA9550-21-1-0125.U. S. National Science Foundation (NSF) under award ECCS-2029558 and DMR-2046227.

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Publication: McLaughlin, N.J., Wang, H., Huang, M., Lee-Wong, E., Hu, L., Lu, H., Yan, G.Q., Gu, G., Wu, C., You, Y.Z. and Du, C.R., 2021. Strong Correlation Between Superconductivity and Ferromagnetism in an Fe-Chalcogenide Superconductor. Nano Letters, 21(17), pp.7277-7283.

Presenters

  • Nathan J McLaughlin

    • University of California, San Diego

Authors

  • Nathan J McLaughlin

    • University of California, San Diego

  • Hailong Wang

    • University of California, San Diego

  • Mengqi Huang

    • University of California, San Diego

  • Eric J Lee-Wong

    • University of California, San Diego

  • Lunhui Hu

    • The Pennsylvania State University
    • Pennsylvania State University
    • University of California, San Diego
    • Department of Physics, The Pennsylvania State University

  • Hanyi Lu

    • University of California, San Diego

  • Gerald Q Yan

    • University of California, San Diego

  • Genda Gu

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA

  • Congjun Wu

    • University of California, San Diego

  • Yizhuang You

    • University of California, San Diego
    • Harvard University

  • Chunhui R Du

    • University of California, San Diego