Publication details for Professor Tom LancasterChoi, 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. (2012). Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3. Physical Review Letters 108(12): 127204.
- Publication type: Journal Article
- ISSN/ISBN: 0031-9007 (print), 1079-7114 (electronic)
- DOI: 10.1103/PhysRevLett.108.127204
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
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.