Inelastic Neutron Scattering in Semimetallic YbMnBi2

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.

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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