Spin waves and revised crystal structure of honeycomb iridate Na2IrO3 |
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Authors: | 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 |
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Institution: | Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom. |
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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 T(N)=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. |
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