Magnetic interactions and excitations in SrMnSb${}_2$

Abstract

The magnetic interactions in the antiferromagnetic (AFM) Dirac semimetal candidate SrMnSb${}_2$ are investigated using \textit{ab initio} linear response theory and inelastic neutron scattering (INS). Our calculations reveal that the first two nearest in-plane couplings ($J_1$ and $J_2$) are both AFM in nature, indicating a significant degree of spin frustration, which aligns with experimental observations. The orbital resolution of exchange interactions shows that $J_1$ and $J_2$ are dominated by direct and superexchange, respectively. In a broader context, a rigid-band model suggests that electron doping fills the minority spin channel and results in a decrease in the AFM coupling strength for both $J_1$ and $J_2$. To better compare with INS measurements, we calculate the spin wave spectra within a linear spin wave theory, utilizing the computed exchange parameters. Although the calculated spin wave spectra somewhat overestimate the magnon bandwidth, they exhibit overall good agreement with measurements from INS experiments.

References in corpus (32)

• Topological Insulators
• Maximally-localized generalized Wannier functions for composite energy bands
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Maximally localized Wannier functions: Theory and applications
• Maximally-localized Wannier functions for entangled energy bands
• Wannier90 as a community code: new features and applications
• Colloquium: Topological Band Theory
• Quasiparticle Self-Consistent GW Theory
• Linear spin wave theory for single-Q incommensurate magnetic structures
• A magnetic topological semimetal Sr1-yMn1-zSb2 (y, z< 0.1)
• The J1-J2 model: First order phase transition versus deconfinement of spinons
• Calculation of the exchange constants of the Heisenberg model in the plane-wave based methods using the Green's function approach
• Effects of alloying and strain on the magnetic properties of Fe${}_{16}$N${}_2$
• Spin wave dispersion based on the quasiparticle self-consistent $GW$ method: NiO, MnO and $\alpha$-MnAs
• Uniaxial ferromagnetism in the kagome metal TbV${}_6$Sn${}_6$
• Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials
• Electronic structure and magnetic properties in $T_2{\text{AlB}}_2$ ($T$ = Fe, Mn, Cr, Co, and Ni) and their alloys
• Interplay between magnetism and band topology in Kagome magnets $R$Mn${}_6$Sn${}_6$
• Intrinsic magnetic properties of {$R$(Fe${}_{1-x}$Co${}_x$)${}_{11}$Ti$Z$} ($R$ = Y and Ce; $Z$ = H, C, and N)
• Magnetocrystalline Anisotropy of Fe-based $L{1}_0$ Alloys: Validity of Approximate Methods to Treat the Spin-Orbit Interaction
• Intersublattice magnetocrystalline anisotropy using a realistic tight-binding method based on maximally localized Wannier functions
• Electronic structure of the candidate 2D Dirac semimetal SrMnSb2: a combined experimental and theoretical study
• Self-consistently renormailzed spin-wave theory of layered ferromagnets on honeycomb lattice
• Electron irradiation effects on superconductivity in PdTe${}_2$: an application of a generalized Anderson theorem
• Two-dimensional ferromagnetism with long-range interactions in the layered magnetic topological insulator MnBi2Te4
• Low Energy, Coherent, Stoner-like Excitations in CaFe${}_2$As${}_2$
• Spin excitations in K${}_2$Fe${}_{4+x}$Se${}_5$: linear response approach
• Canted Antiferromagnetic phases in the layered candidate Weyl material EuMnSb${}_2$
• Quasi-2D magnetism and origin of the Dirac semimetallic behavior in nonstoichiometric Sr${}_{1-y}$Mn${}_{1-z}$Sb${}_2$ (y, z~$<$0.1)
• Canted antiferromagnetic order and spin dynamics in the honeycomb-lattice Tb2Ir3Ga9
• Controlling Magnetic Order, Magnetic Anisotropy, and Band Topology in Semimetals $\mathrm{Sr}(\mathrm{M}{\mathrm{n}}_{0.9}\mathrm{C}{\mathrm{u}}_{0.1})\mathrm{S}{\mathrm{b}}_2$ and $\mathrm{Sr}(\mathrm{M}{\mathrm{n}}_{0.9}\mathrm{Z}{\mathrm{n}}_{0.1})\mathrm{S}{\mathrm{b}}_2$
• Hole Doping and Antiferromagnetic Correlations above the N{é}el temperature of the Topological Semimetal (Sr${}_{1-x}$K${}_x$)MnSb${}_2$

Cited by in corpus (2)

• Spin dynamics in itinerant antiferromagnet SrCr${}_2$As${}_2$
• Spin waves in Dirac semimetal Ca${}_{0.6}$Sr${}_{0.4}$MnSb${}_2$ investigated with neutrons by the diffraction method