Journal
PHYSICAL REVIEW MATERIALS
Volume 4, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.4.114416
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Funding
- National Science Foundation MRSEC program under NSF [DMR-1720633]
- University of Illinois at Urbana-Champaign
- National Science Foundation [OCI-0725070, ACI-1238993]
- state of Illinois
- DOE Office of Science [DE-AC02-06CH11357]
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To understand spin interactions in materials of the Cu2Sb structure type, inelastic neutron scattering of Fe2As single crystals was examined at different temperatures and incident neutron energies. The experimental phonon spectra match well with the simulated phonon spectra obtained from density functional theory (DFT) calculations. The measured magnon spectra were compared to the simulated magnon spectra obtained via linear spin wave theory with the exchange coupling constants calculated using the spin polarized, relativistic Korringa-Kohn-Rostoker method in Zhang et al. [Inorg. Chem. 52, 3013 (2013)]. The simulated magnon spectra broadly agree with the experimental data although the energy values are underestimated along the K direction. Exchange coupling constants between Fe atoms were refined by fits to the experimental magnon spectra, revealing stronger nearest-neighbor Fe1-Fe1 exchange coupling than previously reported. The strength of this exchange coupling is almost an order of magnitude higher than other exchange interactions despite the three-dimensional nature of the phonon interactions. The lack of scattering intensity at energies above 60 meV makes unconstrained determination of the full set of exchange interactions difficult, which may be a fundamental challenge in metallic antiferromagnets.
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