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${}_3$.

11 pages, 5 figures

References in corpus (12)

• Electric Field Effect in Atomically Thin Carbon Films
• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Magnon Polarons in the Spin Seebeck Effect
• Chirality selective magnon-phonon hybridization and magnon-induced chiral phonons in a layered zigzag antiferromagnet
• Berry curvature in magnon-phonon hybrid systems
• Direct observation of topological magnon polarons in a multiferroic material
• Neutron spectroscopy evidence on the dual nature of magnetic excitations in a van der Waals metallic ferromagnet Fe${}_{2.72}$GeTe${}_2$
• Spin wave Hamiltonian and anomalous scattering in NiPS${}_3$
• Dzyaloshinskii-Moriya Induced Topological Magnon-Phonon Hybridization in 2D Antiferromagnetic Insulators with Tunable Chern Numbers
• Magnon-phonon coupling and two-magnon continuum in two-dimensional triangular antiferromagnet CuCrO2
• Spin wave spectra of single crystal CoPS${}_3$
• From one- to two-magnon excitations in the S=3/2 magnet $\beta$-CaCr${}_2$O${}_4$

Cited by in corpus (1)

• Long-range magnetic order with disordered spin orientations in a high-entropy antiferromagnet