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Spin waves and revised crystal structure of honeycomb iridate Na2IrO3.

Choi, S.K. and Coldea, R. and Kolmogorov, A.N. and Lancaster, T. and Mazin, I.I. and Blundell, S.J. and Radaelli, P.G. and Singh, Yogesh and Gegenwart, P. and Choi, K.R. and Cheong, S.-W. and Baker, P.J. and Stock, C. and Taylor, J. (2012) 'Spin waves and revised crystal structure of honeycomb iridate Na2IrO3.', Physical review letters., 108 (12). p. 127204.


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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:© 2012 American Physical Society
Date accepted:No date available
Date deposited:24 January 2014
Date of first online publication:March 2012
Date first made open access:No date available

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