Tetrahedral magnetic order and the metal-insulator transition in the pyrochlore lattice of Cd 2Os 2O 7

J. Yamaura, K. Ohgushi, H. Ohsumi, T. Hasegawa, I. Yamauchi, K. Sugimoto, S. Takeshita, A. Tokuda, M. Takata, M. Udagawa, M. Takigawa, H. Harima, T. Arima, Z. Hiroi

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Abstract

Cd 2Os 2O 7 shows a peculiar metal-insulator transition at 227 K with magnetic ordering in a frustrated pyrochlore lattice, but its magnetic structure in the ordered state and the transition origin are yet uncovered. We observed a commensurate magnetic peak by resonant x-ray scattering in a high-quality single crystal. X-ray diffraction and Raman scattering experiments confirmed that the transition is not accompanied with any spatial symmetry breaking. We propose a noncollinear all-in-all-out spin arrangement on the tetrahedral network made of Os atoms. Based on this we suggest that the transition is not caused by the Slater mechanism as believed earlier but by an alternative mechanism related to the formation of the specific tetrahedral magnetic order on the pyrochlore lattice in the presence of strong spin-orbit interactions.

Original languageEnglish
Article number247205
JournalPhysical Review Letters
Volume108
Issue number24
DOIs
Publication statusPublished - 2012 Jun 13
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yamaura, J., Ohgushi, K., Ohsumi, H., Hasegawa, T., Yamauchi, I., Sugimoto, K., Takeshita, S., Tokuda, A., Takata, M., Udagawa, M., Takigawa, M., Harima, H., Arima, T., & Hiroi, Z. (2012). Tetrahedral magnetic order and the metal-insulator transition in the pyrochlore lattice of Cd 2Os 2O 7 Physical Review Letters, 108(24), [247205]. https://doi.org/10.1103/PhysRevLett.108.247205