Neutron scattering and first-principles calculations were used to study topological quantum magnets FeSn and Fe3Sn2. Both materials are metallic and have dispersionless flat bands with Dirac nodes at the K point. The localized structure of both compounds was not observed, indicating their metallic nature. In FeSn, the lattice constant in the c-axis decreased anomalously along with changes in the phonon spectra, suggesting the presence of magnetoelastic coupling and spin-phonon interactions. In contrast, Fe3Sn2 did not show any lattice anomaly, and the inelastic signal was mostly due to phonons.
Topological quantum magnets FeSn and Fe3Sn2 were studied using neutron scattering and first-principles calculations. Both materials are metallic but host dispersionless flat bands with Dirac nodes at the K point in reciprocal space. The local structure determined from the pair density function analysis of the neutron-diffraction data provided no evidence for electron localization in both compounds, consistent with their metallic nature. At the same time, in FeSn, an anomalous suppression in the c-axis lattice constant coupled with changes in the phonon spectra were observed across TN indicating the presence of magnetoelastic coupling and spin-phonon interactions. In addition, it was observed that spin waves persisted well above TN, suggesting that the in-plane ferromagnetic spin correlations survive at high temperatures. In contrast, no lattice anomaly was observed in Fe3Sn2. The inelastic signal could be mostly accounted for by phonons, determined from density-functional theory, showing typical softening on warming.
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