Inelastic Neutron Scattering in Semimetallic YbMnBi<sub>2</sub>

ORAL

Abstract

Layered pcnitide AMnBi2 (A=Eu, Sr, Ca, Yb) compounds host quasi-2D square antiferromagnetic layers with alternating Bi square nets responsible for relativistic Dirac bands. Novel transport and peculiar optical conductivity that could be brought on by the coupling of these Dirac bands to the square-lattice antiferromagnetic Mn has garnered further interest in these materials, with the hopes of achieving the magnetically ordered Weyl semimetallic phase. We show that the magnetic lattice in YbMnBi2, fits to a frustated J1-J2 model with antiferromagnetic J1 and J2 interactions, and J2/J1 less than the critical value, 1/2. While we rule out an ordered ferromagnetic coupling that would give rise to a Weyl Semimetal, we explore the relation between relativistic electronic band structure and anisotropic magnetic degrees of freedom.

*This work was supported by the US Department of Energy, office of Basic Energy Sciences, Division of Material Sciences and Engineering under grant DE-FG02-08ER46544

Access to MACS was provided by the Center for High Resolution Neutron Scattering, a partnership between NIST and the NSF under Agreement No. DMR-1508249

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Presenters

  • Timothy Reeder

    • Department of Physics and Astronomy, Johns Hopkins University

Authors

  • Timothy Reeder

    • Department of Physics and Astronomy, Johns Hopkins University

  • Wesley T Fuhrman

    • Institute for Quantum Matter, Johns Hopkins University
    • Department of Physics and Astronomy, Johns Hopkins University
    • Johns Hopkins University

  • Quinn Gibson

    • Department of Chemistry, Princeton University

  • Jose A Rodriguez

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

  • Yiming Qiu

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

  • Matthew Brandon Stone

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Spallation Neutron Source, Oak Ridge National Laboratory

  • Alexander I Kolesnikov

    • ORNL
    • Oak Ridge National Laboratory
    • Spallation Neutron Source, Oak Ridge National Laboratory

  • Robert Cava

    • Department of Chemistry, Princeton University
    • Princeton University
    • Chemistry, Princeton U.
    • Chemistry, Princeton University

  • Collin Broholm

    • Johns Hopkins
    • Johns Hopkins University
    • IQM, Johns Hopkins University
    • Department of Physics and Astronomy, Johns Hopkins University