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Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd2Os2O7

Author

Listed:
  • Thi Minh Hien Nguyen

    (Institute for Basic Science (IBS)
    Seoul National University (SNU))

  • Luke J. Sandilands

    (Institute for Basic Science (IBS)
    Seoul National University (SNU)
    Measurement Science and Standards, National Research Council of Canada)

  • C. H. Sohn

    (Institute for Basic Science (IBS)
    Seoul National University (SNU))

  • C. H. Kim

    (Institute for Basic Science (IBS)
    Seoul National University (SNU))

  • Aleksander L. Wysocki

    (U.S. Department of Energy)

  • In-Sang Yang

    (Ewha Womans University)

  • S. J. Moon

    (Hanyang University)

  • Jae-Hyeon Ko

    (Hallym University)

  • J. Yamaura

    (Tokyo Institute of Technology)

  • Z. Hiroi

    (University of Tokyo)

  • Tae Won Noh

    (Institute for Basic Science (IBS)
    Seoul National University (SNU))

Abstract

5d pyrochlore oxides with all-in-all-out magnetic order are prime candidates for realizing strongly correlated, topological phases of matter. Despite significant effort, a full understanding of all-in-all-out magnetism remains elusive as the associated magnetic excitations have proven difficult to access with conventional techniques. Here we report a Raman spectroscopy study of spin dynamics in the all-in-all-out magnetic state of the 5d pyrochlore Cd2Os2O7. Through a comparison between the two-magnon scattering and spin-wave theory, we confirm the large single ion anisotropy in this material and show that the Dzyaloshinskii–Moriya and exchange interactions play a significant role in the spin-wave dispersions. The Raman data also reveal complex spin–charge–lattice coupling and indicate that the metal–insulator transition in Cd2Os2O7 is Lifshitz-type. Our work establishes Raman scattering as a simple and powerful method for exploring the spin dynamics in 5d pyrochlore magnets.

Suggested Citation

  • Thi Minh Hien Nguyen & Luke J. Sandilands & C. H. Sohn & C. H. Kim & Aleksander L. Wysocki & In-Sang Yang & S. J. Moon & Jae-Hyeon Ko & J. Yamaura & Z. Hiroi & Tae Won Noh, 2017. "Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd2Os2O7," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00228-w
    DOI: 10.1038/s41467-017-00228-w
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