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, Tae Won Noh

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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.

Original languageEnglish
Article number251
JournalNature Communications
Issue number1
StatePublished - 1 Dec 2017

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