Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3

被引：533

作者：

Choi, S. K. ^{[1
]}

Coldea, R. ^{[1
]}

Kolmogorov, A. N. ^{[2
]}

Lancaster, T. ^{[1
]}

Mazin, I. I. ^{[3
]}

Blundell, S. J. ^{[1
]}

Radaelli, P. G. ^{[1
]}

Singh, Yogesh ^{[4
,5
]}

Gegenwart, P. ^{[4
]}

Choi, K. R. ^{[6
]}

Cheong, S. -W. ^{[6
,7
,8
]}

Baker, P. J. ^{[9
]}

Stock, C. ^{[9
]}

Taylor, J. ^{[9
]}

机构：

[1] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

[2] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[3] USN, Res Lab, Washington, DC 20375 USA

[4] Univ Gottingen, Inst Phys 1, D-37077 Gottingen, Germany

[5] Indian Inst Sci Educ & Res Mohali, Sect 81, Mohali, India

[6] Pohang Univ Sci & Technol, L PEM, Pohang 790784, South Korea

[7] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[8] Rutgers State Univ, R CEM, Piscataway, NJ 08854 USA

[9] ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.108.127204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

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