Spin waves and revised crystal structure of honeycomb iridate Na2IrO3.
Phys Rev Lett
; 108(12): 127204, 2012 Mar 23.
Article
em En
| MEDLINE
| ID: mdl-22540621
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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MEDLINE
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article