期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.127204
关键词
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资金
- EPSRC
- DOE [DE-FG02-07ER46382]
- EPSRC [EP/J003557/1, EP/G003092/1, EP/G003092/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G003092/2, EP/J003557/1, EP/G003092/1] Funding Source: researchfish
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 degrees Ir-O-Ir bonds required for dominant Kitaev exchange.
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