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.

Details

Title
Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd2Os2O7
Author
Thi Minh Hien Nguyen 1 ; Sandilands, Luke J 2 ; Sohn, C H 1 ; Kim, C H 1   VIAFID ORCID Logo  ; Wysocki, Aleksander L 3 ; Yang, In-Sang 4 ; Moon, S J 5 ; Jae-Hyeon Ko 6 ; Yamaura, J 7 ; Hiroi, Z 8 ; Noh, Tae Won 1 

1  Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul, Republic of Korea; Department of Physics and Astronomy, Seoul National University (SNU), Seoul, Republic of Korea 
2  Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul, Republic of Korea; Department of Physics and Astronomy, Seoul National University (SNU), Seoul, Republic of Korea; Measurement Science and Standards, National Research Council of Canada, Ottawa, Ontario, Canada 
3  Ames Laboratory, U.S. Department of Energy, Ames, Iowa, USA 
4  Department of Physics and Division of Nano-Sciences, Ewha Womans University, Seoul, Republic of Korea 
5  Department of Physics, Hanyang University, Seoul, Republic of Korea 
6  Department of Physics, Hallym University, Chuncheon, Gangwondo, Republic of Korea 
7  Materials Research Center for Element Strategy, Tokyo Institute of Technology, Kanagawa, Japan 
8  Institute for Solid State Physics, University of Tokyo, Kashiwa, Japan 
Pages
1-8
Publication year
2017
Publication date
Aug 2017
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1038/s41467-017-00228-w
ProQuest document ID
1929060014
Copyright
© 2017. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.