Magnetic structure and magnon dynamics of the quasi-two-dimensional antiferromagnet FePS3

D. Lançon, H. C. Walker, E. Ressouche, B. Ouladdiaf, K. C. Rule, G. J. McIntyre, T J Hicks, H. M. Rønnow, A. R. Wildes

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Neutron scattering from single crystals has been used to determine the magnetic structure and magnon dynamics of FePS3, an S=2 Ising-like quasi-two-dimensional antiferromagnet with a honeycomb lattice. The magnetic structure has been confirmed to have a magnetic propagation vector of kM=0112 and the moments are collinear with the normal to the ab planes. The magnon data could be modeled using a Heisenberg Hamiltonian with a single-ion anisotropy. Magnetic interactions up to the third in-plane nearest neighbor needed to be included for a suitable fit. The best fit parameters for the in-plane exchange interactions were J1=1.46, J2=-0.04, and J3=-0.96 meV. The single-ion anisotropy is large, Δ=2.66 meV, explaining the Ising-like behavior of the magnetism in the compound. The interlayer exchange is very small, J′=-0.0073 meV, proving that FePS3 is a very good approximation to a two-dimensional magnet.

Original languageEnglish
Article number214407
Number of pages11
JournalPhysical Review B
Issue number21
Publication statusPublished - 7 Dec 2016

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