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

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 and Tae Won Noh ()
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Thi Minh Hien Nguyen: Institute for Basic Science (IBS)
Luke J. Sandilands: Institute for Basic Science (IBS)
C. H. Sohn: Institute for Basic Science (IBS)
C. H. Kim: Institute for Basic Science (IBS)
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)

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-00228-w

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