Coexistence of superconductivity and magnetic order in a kagome lattice material

ORAL

Abstract

The intertwining of superconductivity, magnetism, and non-trivial topology is at the frontier of condensed matter physics. Kagome lattices have attracted research interest due to their potential for hosting a quantum spin liquid. Recently, it was demonstrated that they can possibly host both topologically protected bands and non-dispersing or flat bands. Ru atoms form a kagome lattice perpendicular to the [111] direction in CeRu2. Our density-functional theory (DFT) calculations also revealed a kagome flat band near the Fermi surface. At ambient pressure, CeRu2 shows a sharp superconducting transition at ~ 5 K based on resistivity measurements, as well as a weak magnetic order at temperatures up to ~ 40 K. A systematic investigation was performed to study the superconductivity and magnetic order in CeRu2 under pressure via both magnetic and resistivity measurements. An unusual magnetic phase diagram that suggests an intriguing interplay between its superconducting order parameters has been constructed. A Tc resurgence was detected under pressure above ~ 30 GPa. Detailed results will be presented and discussed.

*This work is supported by US Air Force Office of Scientific Research Grants FA9550-15-1-0236 and FA9550-20-1-0068, the T. L. L. Temple Foundation, the John J. and Rebecca Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston.

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Presenters

  • Liangzi Deng

    • University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

Authors

  • Liangzi Deng

    • University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA

  • Melissa J Gooch

    • University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston

  • Trevor Bontke

    • University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston

  • Jiaxin Yin

    • Princeton University
    • Department of Physics, Princeton University

  • Youguo Shi

    • Chinese Academy of Sciences
    • Institute of Physics, the Chinese Academy of Sciences
    • Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
    • Institute of Physics, Chinese Academy of Sciences

  • Qimiao Si

    • Rice University
    • Department of Physics & Astronomy, Rice Center for Quantum Materials, Rice University

  • Guoqing Chang

    • Nanyang Technological University
    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University

  • Zheng Wu

    • University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston

  • Ching-Wu W Chu

    • Texas Center for Superconductivity and Department of Physics, University of Houston
    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA; Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
    • University of Houston and Lawrence Berkeley National Laboratory