Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd2Os2O7open access
- Authors
- Thi Minh Hien Nguyen; Sandilands, Luke J.; Sohn, C. H.; Kim, C. H.; Wysocki, Aleksander L.; Yang, In-Sang; Moon, S. J.; Ko, Jae-Hyeon; Yamaura, J.; Hiroi, Z.; Noh, Tae Won
- Issue Date
- Aug-2017
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE COMMUNICATIONS, v.8, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 8
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/151900
- DOI
- 10.1038/s41467-017-00228-w
- ISSN
- 2041-1723
- 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.
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