Investigation of the magnon dispersion in Lu<sub>2</sub>V<sub>2</sub>O<sub>7</sub> and magnon Weyl point

ORAL

Abstract

The ferromagnetic pyrochlore lattice with Dzyaloshinskii-Moriya (DM) interactions has attracted much attention due to predicted Weyl points in the magnon spectrum [1,2]. The pyrochlore Lu2V2O7 has been suggested as a strong candidate to realize the concept [2]; it has a ferromagnetic ground state below TC~69.5 K [3] and the presence of a magnon Hall effect indicates a strong DM interaction [4]. We use inelastic neutron scattering to examine the spin wave excitations in the compound. These measurements enable us to detect sharp magnon dispersions that are well modeled with linear spin wave theory.
[1] A. Mook et al., PRL 117 157204 (2016)
[2] Y. Su et al., PRB 95 224403 (2017)
[3] H. Zhou et al., PRB 77 020411(R) (2008)
[4] Y. Onose et al., Science 329 297 (2010)

*This research was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Presenters

  • Seunghwan Do

    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, OakRidge National Laboratory

Authors

  • Seunghwan Do

    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, OakRidge National Laboratory

  • Jeffrey Rau

    • Department of Physics, University of Windsor
    • University of Windsor

  • Hasitha Suriya Arachchige

    • Physics and Astronomy, The University of Tennessee
    • Department of Physics & Astronomy, University of Tennessee, Knoxville
    • Department of Physics, University of Tennessee
    • University of Tennessee
    • Department of Physics and Astronomy, The University of Tennessee

  • Binod K. Rai

    • Materials Science and Technology Division, Oak Ridge National Lab

  • Gabriele Sala

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

  • Victor R. Fanelli

    • Neutron Scattering Division, Oak Ridge National Lab

  • Matthew Stone

    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Quantum Condensed Matter Div, Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Spallation Neutron Source, Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Lab
    • Neutron Scattering Division, OakRidge National Laboratory

  • Qing Huang

    • University of Tennessee
    • Department of Physics & Astronomy, University of Tennessee
    • University of Tennessee, Knoxville
    • Department of Physics, University of Tennessee
    • Physics, University of Tennessee, Knoxville
    • Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Haidong Zhou

    • University of Tennessee
    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • University of Knoxville, Tennessee
    • Department of Physics & Astronomy, University of Tennessee
    • University of Tennesse, Knoxville
    • Physics and anstronomy, University of Tennessee
    • Department of Physics, University of Tennessee
    • Physics, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville

  • Mark D Lumsden

    • Neutron Scattering Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Neutron Scattering Division, OakRidge National Laboratory

  • Andrew D Christianson

    • Materials Science & Technology Division, Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Materials Science and Technology Division, OakRidge National Laboratory