Generalized SU(3) Spin Wave Theory on Effective S=1 Triangular Lattice Magnet FeI<sub>2</sub>

Magnetic and quadrupolar excitations can coexist in magnetically ordered S=1 spin systems because the local Hilbert space has dimension three. By using a generalized SU(3) spin wave theory (GSWT), we uncover the hybridized nature of the low-energy modes revealed by inelastic neutron scattering (INS) measurements of the effective S=1 triangular antiferromagnet FeI₂. Band crossing between dipolar and quadrupolar modes enables a large hybridization between them that is induced by symmetric exchange anisotropy. Because of this hybridization, modes with dominant quadrupolar character can be observed with INS. These modes can also be obtained from a generalized Landau-Lifshitz dynamics of SU(3) spins (3 dipolar + 5 quadrupolar components), which turns out to be the adequate dynamics for describing the low-temperature dynamical properties of FeI₂.

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Bulletin of the American Physical Society

APS March Meeting 2020

Volume 65, Number 1

Monday–Friday, March 2–6, 2020; Denver, Colorado

Session R46: Triangular Lattice II

Abstract: R46.00002 : Generalized SU(3) Spin Wave Theory on Effective S=1 Triangular Lattice Magnet FeI2

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Abstract: R46.00002 : Generalized SU(3) Spin Wave Theory on Effective S=1 Triangular Lattice Magnet FeI₂