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Two-dimensional van der Waals compounds with magnetic ions on a honeycomblattice are hosts to a variety of exotic behavior. The magnetic interactions inone such compound, MnPSe$_3$, are investigated with elastic and inelasticneutron scattering. Magnetic excitations are observed in the magneticallyordered regime and persist to temperatures well above the ordering temperature,$\rm T_N$ = 74 K, consistent with low dimensional magnetic interactions. Theinelastic neutron scattering results allow a model spin Hamiltonian to bepresented that includes dominant intralayer interactions of $J_{1ab}$=0.45 meV,$J_{2ab}$=0.03 meV, $J_{3ab}$=0.19 meV, and appreciable interlayer interactionsof $J_c$=0.031(5) meV. No evidence for anisotropy in the form of a spin-gap isobserved in the data collected. The measurements on MnPSe$_3$ are contrastedwith those on MnPS$_3$ and reveal a large increase in the interlayer exchangeinteractions in MnPSe$_3$, despite the quasi-2D magnetic behavior.

Magnetic exchange interactions in the van der Waals layered antiferromagnet MnPSe3