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Sohn, Chang Hee
Laboratory for Unobtainable Functional Oxides
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Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd2Os2O7

Author(s)
Thi Minh Hien NguyenSandilands, Luke J.Sohn, C. H.Kim, C. H.Wysocki, Aleksander L.Yang, In-SangMoon, S. J.Ko, Jae-HyeonYamaura, J.Hiroi, Z.Noh, Tae Won
Issued Date
2017-08
DOI
10.1038/s41467-017-00228-w
URI
https://scholarworks.unist.ac.kr/handle/201301/26294
Fulltext
https://www.nature.com/articles/s41467-017-00228-w
Citation
NATURE COMMUNICATIONS, v.8, no.1, pp.251
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.
Publisher
NATURE PUBLISHING GROUP
ISSN
2041-1723
Keyword
LIGHT-SCATTERINGRAMAN-SPECTROSCOPYSPINANTIFERROMAGNETSEXCITATIONSSPECTRA

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