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Ni2Mo3O8: Complex Antiferromagnetic Order on a Honeycomb Lattice

Published

Author(s)

Jennifer R. Morey, Allen Scheie, John P. Sheckelton, Craig Brown, Tyrel M. McQueen

Abstract

Theoretical studies have predicted the existence of topological magnons in honeycomb compounds with zig-zag antiferromagnetic (AFM) order. Here we report this discovery of zig-zag AFM order in the layered and non-centrosymmetric honeycomb nickelate Ni2Mo3O8 through a combination of magnetization, specific heat, x-ray and neutron diffraction and electron paramagnetic resonance measurements. It is the first example of such order in an integer-spin non-centrosymmetric structure (P63mc). Further, each of the the two distinct sites of the bipartite honeycomb lattice has a unique crystal field environment, octahedral and tetrahedral Ni2+ respectively, enabling independent substitution on each sublattice. Replacement of Ni by Mg on the octahedral site suppresses the long range magnetic order and results in a weakly ferromagnetic state. Conversely, substitution of Fe for Ni enhances the AFM ordering temperature. Thus Ni2Mo3O8 provides a platform on which to explore the rich physics of S=1 on the honeycomb in the presence of competing magnetic interactions with a non-centrosymmetric, formally piezeo-polar, crystal structure.
Citation
Physical Review Materials
Volume
3
Issue
1

Keywords

honeycomb lattice, nickelate, neutron diffraction

Citation

Morey, J. , Scheie, A. , Sheckelton, J. , Brown, C. and McQueen, T. (2019), Ni<sub>2</sub>Mo<sub>3</sub>O<sub>8</sub>: Complex Antiferromagnetic Order on a Honeycomb Lattice, Physical Review Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=925978 (Accessed April 15, 2024)
Created January 17, 2019, Updated October 12, 2021