Spin waves and revised crystal structure of honeycomb iridate Na2IrO3

Details Spin waves and revised crystal structure of honeycomb iridate Na2IrO3 Spin waves and revised crystal structure of honeycomb iridate Na2IrO3

2012-02-06

arxiv.org/abs/1202.1268v1

Phys. Rev. Lett. 108, 127204 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

to appear in PRL, 12 pages including supplmental material

Scientific paper

10.1103/PhysRevLett.108.127204

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 zig-zag magnetic order. The onset of long-range magnetic order below 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 deg Ir-O-Ir bonds required for dominant Kitaev exchange.

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