Possible charge disproportionation in 3R-AgNiO2 studied by neutron powder diffraction
- Authors
- Chung, J. -H.; Lim, J. -H.; Shin, Y. J.; Kang, J. -S.; Jaiswal-Nagar, D.; Kim, K. H.
- Issue Date
- 12월-2008
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.78, no.21
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 78
- Number
- 21
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/122335
- DOI
- 10.1103/PhysRevB.78.214417
- ISSN
- 2469-9950
- Abstract
- Using neutron-scattering techniques, we have investigated the nuclear and the magnetic structures of the triangular antiferromagnet 3R-AgNiO2. The symmetry analysis based on the group theory suggests that the root 3 x root 3 charge order proposed for 2H-AgNiO2 [E. Wawrzynska et al., Phys. Rev. Lett. 99, 157204 (2007)] will have a monoclinic symmetry if present in the trigonal lattice of 3R-AgNiO2. The Rietveld refinement shows that symmetry reduction in the NiO2 layer is consistent with the prediction of the group theory. The pair density function consistently shows that the nearest-neighbor Ni-O bonds split into two groups separated by approximately 0.1 angstrom. The antiferromagnetic Bragg peaks observed below T-N=25 K can be described by the propagation vector k=(0,1, 0) of the monoclinic unit cell. The similarities of the local structure and the antiferromagnetic order strongly suggest that the novel charge order observed in 2H-AgNiO2 also exists in 3R-AgNiO2.
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