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Title: Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd 2Os 2O 7

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 Cd 2Os 2O 7. 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 Cd 2Os 2O 7 is Lifshitz-type. In conclusion, our work establishes Raman scattering as a simple and powerful method for exploring the spin dynamics in 5d pyrochlore magnets.

Authors:
 [1];  [2];  [1]; ORCiD logo [1];  [3];  [4];  [5];  [6];  [7];  [8];  [1]
  1. Institute for Basic Science (IBS), Seoul (Republic of Korea); Seoul National Univ. (SNU), Seoul (Republic of Korea)
  2. Institute for Basic Science (IBS), Seoul (Republic of Korea); Seoul National Univ. (SNU), Seoul (Republic of Korea); National Research Council of Canada, Ottawa, ON (Canada)
  3. Ames Lab., Ames, IA (United States)
  4. Ewha Womans Univ., Seoul (Republic of Korea)
  5. Hanyang Univ., Seoul (Republic of Korea)
  6. Hallym Univ., Gangwondo (Republic of Korea)
  7. Tokyo Institute of Technology, Kanagawa (Japan)
  8. Univ. of Tokyo, Kashiwa (Japan)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1377619
Report Number(s):
IS-J-9424
Journal ID: ISSN 2041-1723; PII: 228
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and materials; magnetic properties and materials

Citation Formats

Nguyen, Thi Minh Hien, 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., and Noh, Tae Won. Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd2Os2O7. United States: N. p., 2017. Web. doi:10.1038/s41467-017-00228-w.
Nguyen, Thi Minh Hien, 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. Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd2Os2O7. United States. doi:10.1038/s41467-017-00228-w.
Nguyen, Thi Minh Hien, 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., and Noh, Tae Won. Tue . "Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd2Os2O7". United States. doi:10.1038/s41467-017-00228-w. https://www.osti.gov/servlets/purl/1377619.
@article{osti_1377619,
title = {Two-magnon scattering in the 5d all-in-all-out pyrochlore magnet Cd2Os2O7},
author = {Nguyen, Thi Minh Hien and Sandilands, Luke J. and Sohn, C. H. and Kim, C. H. and Wysocki, Aleksander L. and Yang, In -Sang and Moon, S. J. and Ko, Jae -Hyeon and Yamaura, J. and Hiroi, Z. and Noh, Tae Won},
abstractNote = {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. In conclusion, our work establishes Raman scattering as a simple and powerful method for exploring the spin dynamics in 5d pyrochlore magnets.},
doi = {10.1038/s41467-017-00228-w},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {Tue Aug 15 00:00:00 EDT 2017},
month = {Tue Aug 15 00:00:00 EDT 2017}
}

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