Searching non-trivial topological phases in nonsymmorphic CeAuBi<sub>2</sub>

ORAL

Abstract


Nonsymmorphic structures are promising to host Dirac and Weyl fermions due to the presence of protected band crossings. The Kondo effect, present in Ce-based compounds, may pin these crossings to the Fermi level, favoring non-trivial topological effects. Here, we report the properties of stoichiometric CeAuBi2. It crystallizes in the ZrSiS tetragonal P4/nmm nonsymmorphic structure and orders antiferromagnetically below 19 K with a propagation vector (0 0 1/2). At low temperatures, magnetic fields parallel to the c-axis induce several metamagnetic transitions, similar to CeAuSb2, and a linear positive magnetoresistance is observed, which suggests the presence of band crossings near the Fermi level. The application of external pressure favors the antiferromagnetism. Finally, neutron magnetic diffraction as a function of magnetic field will be discussed.

*This work was supported by FAPESP grants 2015/15665-3, 2017/10581-1, 2017/25269-3, 2018/11364-7, 2019/04196-3, CNPq grant 304496/2017-0, and CAPES, Brazil. Work at Los Alamos was performed under the auspices of the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering under projects “Quantum Fluctuations in Narrow-Band Systems” and “Integrated Modeling of Novel and Dirac Materials”.

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Presenters

  • Mario Moda Piva

    • Max Planck Institute for Chemical Physics of Solids

Authors

  • Mario Moda Piva

    • Max Planck Institute for Chemical Physics of Solids

  • Eleanor M. Clements

    • NIST Center for Neutron Research

  • Rodolfo Tartaglia

    • “Gleb Wataghin” Institute of Physics, University of Campinas
    • Instituto de Física “Gleb Wataghin”, UNICAMP

  • Gabriel S. Freitas

    • Instituto de Física “Gleb Wataghin”, UNICAMP

  • Jean Souza

    • UNICAMP-Univ de Campinas
    • Instituto de Física “Gleb Wataghin”, UNICAMP

  • Denise S. Christovam

    • Instituto de Física “Gleb Wataghin”, UNICAMP

  • Sean Thomas

    • Los Alamos National laboratory
    • Los Alamos National Laboratory

  • Juscelino B. Leao

    • NIST Center for Neutron Research

  • William Ratcliff

    • National Institute of Standards and Technology
    • NIST Center for Neutron Research

  • Jeffrey W Lynn

    • Center for Neutron Research, National Institute of Standards and Technology
    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • Quantum Materials Center, University of Maryland, College Park
    • NIST Center for Neutron Research
    • National Institute of Standards and Technology

  • Christopher Lane

    • Los Alamos National Laboratory
    • Theoretical Division (T-4) / CINT, Los Alamos National Laboratory

  • Jian-Xin Zhu

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory
    • Theoretical Division/Center for Integrated Nanotechnology, Los Alamos National Laboratory
    • Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Lab
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory

  • Joe Thompson

    • Los Alamos National Lab
    • Los Alamos National laboratory
    • Los Alamos National Laboratory

  • Priscila Rosa

    • Los Alamos National Lab
    • Los Alamos National Laboratory
    • Quantum Group, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

  • Cris Adriano

    • UNICAMP-Univ de Campinas
    • Instituto de Física “Gleb Wataghin”, UNICAMP

  • Eduardo Granado

    • UNICAMP - Universidade Estadual de Campinas
    • “Gleb Wataghin” Institute of Physics, University of Campinas
    • Instituto de Física “Gleb Wataghin”, UNICAMP

  • Pascoal G. Pagliuso

    • UNICAMP-Univ de Campinas
    • Instituto de Física “Gleb Wataghin”, UNICAMP