Evidence for biquadratic exchange in the quasi-two-dimensional antiferromagnet FePS${}_3$

Abstract

FePS${}_3$ is a van der Waals compound with a honeycomb lattice that is a good example of a two-dimensional antiferromagnet with Ising-like anisotropy. Neutron spectroscopy data from FePS3 were previously analysed using a straight-forward Heisenberg Hamiltonian with a single-ion anisotropy. The analysis captured most of the elements of the data, however some significant discrepancies remained. The discrepancies were most obvious at the Brillouin zone boundaries. The data are subsequently reanalysed allowing for unequal exchange between nominally equivalent nearest-neighbours, which resolves the discrepancies. The source of the unequal exchange is attributed to a biquadratic exchange term in the Hamiltonian which most probably arises from a strong magnetolattice coupling. The new parameters show that there are features consistent with Dirac magnon nodal lines along certain Brillouin zone boundaries.

8 pages, 4 figures. The following article has been accepted by the Journal of Applied Physics. After it is published, it will be found at (https://publishing.aip.org/resources/librarians/products/journals/). The article was submitted as part of a special topic edition (https://publishing.aip.org/publications/journals/special-topics/jap/2d-quantum-materials-magnetism-and-superconductivity/)

References in corpus (3)

• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Dirac magnons in honeycomb ferromagnets
• Spin dynamics of frustrated easy-axis triangular antiferromagnet 2H-AgNiO2 explored by inelastic neutron scattering

Cited by in corpus (12)

• Magnon-polarons in van der Waals antiferromagnet FePS3
• Terahertz field-induced metastable magnetization near criticality in FePS3
• High pressure tuning of magnon-polarons in the layered antiferromagnet FePS${}_3$
• Orbital and magnetic ordering in single-layer FePS3: A DFT+U study
• High-angular momentum excitations in collinear antiferromagnet FePS${}_3$
• Effect of biquadratic magnetic exchange interaction in the 2D antiferromagnets MPS_3 (M = Mn, Fe, Co, Ni)
• Hierarchical excitations from correlated spin tetrahedra on the breathing pyrochlore lattice
• Tailoring spin waves in 2D transition metal phosphorus trichalcogenides via atomic-layer substitution
• Transverse and longitudinal magnons in strongly anisotropic antiferromagnet FePSe3
• Orbital magnetization in two-dimensional materials from high-throughput computational screening
• Pressure-induced transitions in FePS${}_3$: Structural, magnetic and electronic properties
• Thermally-induced mimicry of quantum cluster excitations and implications for the magnetic transition in FePSe${}_3$