Magnetic Interactions in the Polar Ferrimagnet with a Bipartite Structure

Abstract

The polar magnets A${}_2$Mo${}_3$O${}_8$ (A=Fe, Mn, Co, and Ni) feature a bipartite structure, where the magnetic A${}^{2+}$ ions occupy two different sites with octahedral and tetrahedral oxygen coordinations. This bipartite structure provides a platform for the emergence of nontrivial magnetoelectric (ME) effects and intriguing excitation behaviors, and thus creates significant research interest. In this study, we conduct inelastic neutron scattering measurements on single crystals of Mn${}_2$Mo${}_3$O${}_8$, an L-type ferrimagnet in the A${}_2$Mo${}_3$O${}_8$ family, to investigate its spin dynamics. The obtained magnetic excitation spectra reveal two distinct magnon dispersions corresponding to the octahedral and tetrahedral spins in Mn${}_2$Mo${}_3$O${}_8$. These magnon bands can be well described by a spin Hamiltonian including Heisenberg and single-ion anisotropy terms. Employing our effective spin model, we successfully reproduce the unusual temperature dependence of the L-type ferrimagnetic susceptibility through self-consistent mean-field theory. This research reveals the significance of the bipartite structure in determining the excitation properties of the polar magnets ${\mathrm{A}}_2\mathrm{M}{\mathrm{o}}_3{\mathrm{O}}_8$ and provides valuable insights into the spin dynamics of L-type ferrimagnets.

8 pages, 5 figues, published in PRB

References in corpus (30)

• Electronic transport in two dimensional graphene
• Quantum Spin Liquids
• Mantid - Data Analysis and Visualization Package for Neutron Scattering and $\mu SR$ Experiments
• Quantum Spin Liquid States
• Herbertsmithite and the Search for the Quantum Spin Liquid
• Linear spin wave theory for single-Q incommensurate magnetic structures
• Topological spin excitations in honeycomb ferromagnet CrI${}_3$
• Pseudospin exchange interactions in d^7 cobalt compounds: Possible realization of the Kitaev model
• HORACE: software for the analysis of data from single crystal spectroscopy experiments at time-of-flight neutron instruments
• Experimental identification of quantum spin liquids
• Kitaev-Heisenberg Hamiltonian for High-Spin $d^7$ Mott Insulators
• Quantum states and intertwining phases in kagome materials
• Unveiling hidden ferrimagnetism and giant magnetoelectricity in polar magnet Fe2Mo3O8
• Interlayer Dzyaloshinskii-Moriya interactions
• Discovery of coexisting Dirac and triply degenerate magnons in a three-dimensional antiferromagnet
• Diagonal magnetoelectric susceptibility and effect of Fe-doping in a polar ferrimagnet Mn2Mo3O8
• Triangular lattice quantum dimer model with variable dimer density
• Emergent Glassy Dynamics in a Quantum Dimer Model
• Structure, phonons, and orbital degrees of freedom in Fe${}_2$Mo${}_3$O${}_8$
• Electromagnon resonance in a collinear spin state of a polar antiferromagnet Fe2Mo3O8
• Ni${}_2$Mo${}_3$O${}_8$: zig-zag antiferromagnetic order an integer spin non-centrosymmetric honeycomb lattice
• Direct observation of topological magnon polarons in a multiferroic material
• Dzyaloshinskii-Moriya Interaction in Magneto-Ferroelectric Superlattices: Spin Waves and Skyrmions
• Spectroscopic and first principle DFT+eDMFT study of complex structural, electronic, and vibrational properties of $M_2$Mo${}_3$O${}_8$ ($M$=Fe, Mn) polar magnets
• Colossal linear magnetoelectricity in polar magnet Fe2Mo3O8
• Emergence of spinons in layered trimer iridate Ba4Ir3O10
• Magnetic and vibronic THz excitations in Zn doped Fe${}_2$Mo${}_3$O${}_8$
• Diffusive Excitonic Bands from Frustrated Triangular Sublattice in a Singlet-Ground-State System
• Magnetic anisotropy and exchange paths for octa- and tetrahedrally coordinated Mn${}^{2+}$ ions in the honeycomb multiferroic Mn${}_2$Mo${}_3$O${}_8$
• Disorder-induced excitation continuum in a spin-1/2 cobaltate on a triangular lattice

Cited by in corpus (1)

• Magnetic Signature of Chiral Phonons Revealed by Neutron Spectroscopy in Ferrimagnetic Fe${}_{1.75}$Zn${}_{0.25}$Mo${}_3$O${}_8$