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Title: Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd 2Os 2O 7

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 Cd 2Os 2O 7. 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 Cd 2Os 2O 7 is Lifshitz-type. In conclusion, our work establishes Raman scattering as a simple and powerful method for exploring the spin dynamics in 5d pyrochlore magnets.
 [1] ;  [2] ;  [1] ; ORCiD logo [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [1]
  1. Institute for Basic Science (IBS), Seoul (Republic of Korea); Seoul National Univ. (SNU), Seoul (Republic of Korea)
  2. Institute for Basic Science (IBS), Seoul (Republic of Korea); Seoul National Univ. (SNU), Seoul (Republic of Korea); National Research Council of Canada, Ottawa, ON (Canada)
  3. Ames Lab., Ames, IA (United States)
  4. Ewha Womans Univ., Seoul (Republic of Korea)
  5. Hanyang Univ., Seoul (Republic of Korea)
  6. Hallym Univ., Gangwondo (Republic of Korea)
  7. Tokyo Institute of Technology, Kanagawa (Japan)
  8. Univ. of Tokyo, Kashiwa (Japan)
Publication Date:
Report Number(s):
Journal ID: ISSN 2041-1723; PII: 228
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
Country of Publication:
United States
36 MATERIALS SCIENCE; electronic properties and materials; magnetic properties and materials
OSTI Identifier: