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Title: Zig-zag magnetic ordering in honeycomb-layered Na3Co2SbO6
Authors: Wong, C
Avdeev, M
Ling, CD
Keywords: Neutron diffraction
Honeycomb structures
Antiferromagnetic materials
Magnetic moments
Issue Date: 1-Nov-2016
Publisher: Elsevier
Citation: Wong, C., Avdeev, M., & Ling, C. D. (2016) Zig-zag magnetic ordering in honeycomb-layered Na3Co2SbO6. Journal of Solid State Chemistry, 243, 18-22. doi:10.1016/j.jssc.2016.07.032
Abstract: Na3Co2SbO6 is a layered oxide with a hexagonal O3-type structure, in which CdI2-type edge-sharing MO6 octahedral layers are intercalated by Na. The MO6 octahedral layer in turn adopts a honeycomb ordering pattern of magnetic (S=3/2) Co2+ sites surrounding isolated non-magnetic Sb5+ sites. Magnetic susceptibility measurements show that Na3Co2SbO6 orders antiferromagnetically below TN=8.3 K, with an effective magnetic moment of 5.22 μB (indicating a strong orbital contribution above the expected spin-only value of ). While a honeycomb arrangement of magnetic cations could, in principle, support a co-operative long-range-ordered magnetic structure in which all nearest neighbors are antiferromagnetic with respect to one another, symmetry analysis of low-temperature neutron powder diffraction data shows that it instead adopts a partially frustrated ‘zig-zag’ ordering in which 2/3 of nearest-neighbor interactions are ferromagnetic and 1/3 are antiferromagnetic. The low Néel temperature and Weiss constant of underlines the presence of significant frustration of the expected strong superexchange interactions among Co2+. © 2016 Elsevier Inc.
ISSN: 0022-4596
Appears in Collections:Journal Articles

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