Journal
PHYSICAL REVIEW B
Volume 85, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.180403
Keywords
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Funding
- Division of Chemical Sciences, Geosciences, and Biosciences
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- NSF [DMR-0856234, EPS-0814194]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0856234] Funding Source: National Science Foundation
- Office Of The Director
- EPSCoR [814194] Funding Source: National Science Foundation
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We have combined single-crystal neutron and x-ray diffractions to investigate the magnetic and crystal structures of the honeycomb lattice Na2IrO3. The system orders magnetically below 18.1(2) K with Ir4+ ions forming zigzag spin chains within the layered honeycomb network with an ordered moment of 0.22(1) mu(B)/Ir site. Such a configuration sharply contrasts with the Neel or stripe states proposed in the Kitaev-Heisenberg model. The structure refinement reveals that the Ir atoms form a nearly ideal two-dimensional honeycomb lattice while the IrO6 octahedra experience a trigonal distortion that is critical to the ground state. The results of this study provide much needed experimental insights into the magnetic and crystal structure that are crucial to the understanding of the exotic magnetic order and possible topological characteristics in the 5d-electron-based honeycomb lattice.
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