S.K. Choi
Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3
Choi, S.K.; Coldea, R.; Kolmogorov, A.N.; Lancaster, T.; Mazin, I.I.; Blundell, S.J.; Radaelli, P.G.; Singh, Yogesh; Gegenwart, P.; Choi, K.R.; Cheong, S.-W.; Baker, P.J.; Stock, C.; Taylor, J.
Authors
R. Coldea
A.N. Kolmogorov
Professor Tom Lancaster tom.lancaster@durham.ac.uk
Professor
I.I. Mazin
S.J. Blundell
P.G. Radaelli
Yogesh Singh
P. Gegenwart
K.R. Choi
S.-W. Cheong
P.J. Baker
C. Stock
J. Taylor
Abstract
We report inelastic neutron scattering measurements on Na2IrO3, a candidate for the Kitaev spin model on the honeycomb lattice. We observe spin-wave excitations below 5 meV with a dispersion that can be accounted for by including substantial further-neighbor exchanges that stabilize zigzag magnetic order. The onset of long-range magnetic order below TN ¼ 15:3 K is confirmed via the observation of oscillations in zero-field muon-spin rotation experiments. Combining single-crystal diffraction and density functional calculations we propose a revised crystal structure model with significant departures from the ideal 90 Ir-O-Ir bonds required for dominant Kitaev exchange.
Citation
Choi, S., Coldea, R., Kolmogorov, A., Lancaster, T., Mazin, I., Blundell, S., …Taylor, J. (2012). Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3. Physical Review Letters, 108(12), Article 127204. https://doi.org/10.1103/physrevlett.108.127204
Journal Article Type | Article |
---|---|
Publication Date | Mar 20, 2012 |
Deposit Date | Mar 4, 2013 |
Publicly Available Date | Mar 28, 2024 |
Journal | Physical Review Letters |
Print ISSN | 0031-9007 |
Electronic ISSN | 1079-7114 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 108 |
Issue | 12 |
Article Number | 127204 |
DOI | https://doi.org/10.1103/physrevlett.108.127204 |
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Copyright Statement
© 2012 American Physical Society
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