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- W2945753709 abstract "Using neutron-scattering techniques, we have investigated the nuclear and the magnetic structures of the triangular antiferromagnet $3R{text{-AgNiO}}_{2}$. The symmetry analysis based on the group theory suggests that the $sqrt{3}ifmmodetimeselsetexttimesfi{}sqrt{3}$ charge order proposed for $2H{text{-AgNiO}}_{2}$ [E. Wawrzyifmmode acute{n}else '{n}fi{}ska et al., Phys. Rev. Lett. 99, 157204 (2007)] will have a monoclinic symmetry if present in the trigonal lattice of $3R{text{-AgNiO}}_{2}$. The Rietveld refinement shows that symmetry reduction in the ${text{NiO}}_{2}$ 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 $0.1text{ }text{AA{}}$. The antiferromagnetic Bragg peaks observed below ${T}_{N}=25text{ }text{K}$ can be described by the propagation vector $mathbf{k}=(0,1,0)$ of the monoclinic unit cell. The similarities of the local structure and the antiferromagnetic order strongly suggest that the novel charge order observed in $2H{text{-AgNiO}}_{2}$ also exists in $3R{text{-AgNiO}}_{2}$." @default.
- W2945753709 created "2019-05-29" @default.
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- W2945753709 date "2008-12-11" @default.
- W2945753709 modified "2023-09-27" @default.
- W2945753709 title "Possible charge disproportionation in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mn>3</mml:mn><mml:mi>R</mml:mi><mml:msub><mml:mrow><mml:mtext>-AgNiO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>studied by neutron powder diffraction" @default.
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- W2945753709 doi "https://doi.org/10.1103/physrevb.78.214417" @default.
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