The magnetic dynamics of NiPS${}_3$

Abstract

Neutron spectroscopy measurements have been performed on single crystals of the antiferromagnetic van der Waals compound NiPS${}_3$. Linear spin wave theory using a Heisenberg Hamiltonian with single-ion anisotropies has been applied to determine the magnetic exchange parameters and the nature of the anisotropy. The analysis reveals that NiPS${}_3$ is less two-dimensional than its sister compounds, with a relatively large ferromagnetic exchange of $J^{\prime }=-0.3$ meV between the layered \emph{ab} planes. In-plane magnetic exchange interactions up to the third nearest-neighbour were required to fit the data. The nearest-neighbour exchange was ferromagnetic with $J_1=-2.6$ meV, the second neighbour was antiferromagnetic and small with $J_2=0.2$ meV, and the dominant antiferromagnetic third neighbour exchange was $J_3=13.5$ meV. The anisotropy was shown to be largely XY-like with a small uniaxial component, leading to the appearance of two low-energy spin wave modes in the spin wave spectrum at the Brillouin zone centre. The analysis could reproduce the spin wave energies, however there are discrepancies with the calculated neutron intensities hinting at more exotic phenomena.

arXiv comment12 pages, 8 figures, 33 references

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• Dimensionality crossover to 2D vestigial nematicity from 3D zigzag antiferromagnetism in an XY-type honeycomb van der Waals magnet
• Spin wave spectra of single crystal CoPS${}_3$
• Observation of three-state nematicity and domain evolution in atomically-thin antiferromagnetic NiPS3
• Molecular intercalation in the van der Waals antiferromagnets FePS3 and NiPS3
• Dimensionality dependent electronic structure of the exfoliated van der Waals antiferromagnet NiPS${}_3$
• Magnetic anisotropy and low-energy spin dynamics in the van der Waals compounds Mn${}_2$P${}_2$S${}_6$ and MnNiP${}_2$S${}_6$
• Direct Observation and Analysis of Low-Energy Magnons with Raman Spectroscopy in Atomically Thin NiPS3
• Effect of biquadratic magnetic exchange interaction in the 2D antiferromagnets MPS_3 (M = Mn, Fe, Co, Ni)
• Electron Spin Resonance Spectroscopy on Magnetic Van der Waals Compounds
• Tutorial: Extracting entanglement signatures from neutron spectroscopy
• Spin model for the Honeycomb $\mathrm{NiP}{\mathrm{S}}_3$
• Evolution of the spin dynamics in the van der Waals system $M_{\text{2}}$P${}_{\text{2}}$S${}_{\text{6}}$ (${\mathbf{M}}_{\text{2}}$ = Mn${}_{\text{2}}$, MnNi, Ni${}_{\text{2}}$) series probed by electron spin resonance spectroscopy
• Long-lived population inversion in resonantly driven excitonic antiferromagnet
• Deconstruction of the anisotropic magnetic interactions from spin-entangled optical excitations in van der Waals antiferromagnets
• Revealing the Electronic Structure of van der Waals Antiferromagnetic NiPS${}_3$ through Synchrotron-Based $\mu$-ARPES and Alkali Metal Dosing
• Quantum Fluctuations in the van der Walls material $\mathrm{NiP}{\mathrm{S}}_3$
• Thermally-induced mimicry of quantum cluster excitations and implications for the magnetic transition in FePSe${}_3$
• Spin-flip optical excitations in van der Waals antiferromagnet CrPS${}_4$
• Long-range magnetic order with disordered spin orientations in a high-entropy antiferromagnet
• Crucial role of magnetic dipole and anomalous field dependence in $\mathrm{NiP}{\mathrm{S}}_3$
• Stabilization of zigzag order in NiPS${}_3$ via positive biquadratic interaction
• Hamiltonian parameter inference from resonant inelastic x-ray scattering with active learning
• Spin Wave Dispersion of the van der Waals Antiferromagnet NiPS${}_3$