Spin and lattice dynamics of a van der Waals antiferromagnet MnPSe${}_3$

Abstract

Antiferromagnetic van der Waals family $\text{M}\mathrm{P}{\text{X}}_3(\mathrm{M}=\mathrm{Fe},\mathrm{Mn},\mathrm{Co},\text{ and}\mathrm{Ni};\mathrm{X}=\mathrm{S}\text{ and}\mathrm{Se})$ have attracted significant research attention due to the possibility of realizing long-range magnetic order down to the monolayer limit. Here, we perform inelastic neutron scattering measurements on single crystal samples of MnPSe${}_3$, a member of the $\text{M}\mathrm{P}{\text{X}}_3$ family, to study the spin dynamics and determine the effective spin model. The excited magnon bands are well characterized by a spin model, which includes a Heisenberg term with three intraplane exchange parameters ($J_1=-0.73$~meV, $J_2=-0.014$~meV, $J_3=-0.43$~meV) and one interplane parameter ($J_c=-0.054$~meV), and an easy-plane single-ion anisotropy term ($D=-0.035$~meV). Additionally, we observe the intersection of the magnon and phonon bands but no anomalous spectral features induced by the formation of magnon-phonon hybrid excitations at the intersecting region. We discuss possible reasons for the absence of such hybrid excitations in MnPSe${}_3$.

arXiv comment11 pages, 5 figures

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