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Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3

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.

Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3 Thumbnail


Authors

S.K. Choi

R. Coldea

A.N. Kolmogorov

I.I. Mazin

S.J. Blundell

P.G. Radaelli

Yogesh Singh

P. Gegenwart

K.R. Choi

S.-W. Cheong

P.J. Baker

C. Stock

J. Taylor



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 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.

Citation

Choi, S., Coldea, R., Kolmogorov, A., Lancaster, T., Mazin, I., Blundell, S., …Taylor, J. (2012). Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3. Physical Review Letters, 108(12), Article 127204. https://doi.org/10.1103/physrevlett.108.127204

Journal Article Type Article
Publication Date Mar 20, 2012
Deposit Date Mar 4, 2013
Publicly Available Date Mar 28, 2024
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 108
Issue 12
Article Number 127204
DOI https://doi.org/10.1103/physrevlett.108.127204

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Copyright Statement
© 2012 American Physical Society





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