<i>Ab initio</i>
 study of spin fluctuations in the itinerant kagome magnet FeSn

Zhang, Yifan; Ni, Xiao-Sheng; Datta, Trinanjan; Wang, Meng; Yao, Dao‐Xin; Cao, Kun

doi:10.1103/physrevb.106.184422

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…[80] The band structure and DOS (see the SMs) are basically similar in many aspects to the isostructure FeSn. [58][59][60][61][62] Our calculations reproduce the results of previous studies [65] quite well. The magnetic moment of the Fe ions is estimated to be 1.55𝜇B, which is close to the previous experimental value of about 1.72𝜇B.…”

supporting

confidence: 85%

“…[35][36][37] In this system, vHSs are located near the Fermi level and the phonon spectrum exhibits two imaginary phonon frequencies locating at the Brillouin zone (BZ) boundary [𝑀 ( 12 , 0, 0) and 𝐿 ( 1 2 , 0, 1 2 ) points], [29,30] which induce an in-plane 2×2 CDW state identified in experiment. [21][22][23][24][25][26] On the other hand, there are many kagome magnetic materials such as FeSn, [58][59][60][61][62] Fe3Sn2, [63,64] Mn3Sn, [14] Mn3Ge, [50,54] and Co3Sn2S2. [15][16][17] However, it may be due to the large energy separation between flat bands and vHSs that CDW order and magnetic order have not been generally observed simultaneously in one material.…”

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confidence: 99%

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Electron-Correlation-Induced Charge Density Wave in FeGe

Wu 武,

Hu 胡,

Fan 樊

et al. 2023

Chinese Phys. Lett.

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As the first magnetic kagome material to exhibit the charge density wave (CDW) order, FeGe has attracted much attention in recent studies. Similar to AV$_{3}$Sb$_{5}$ (A = K, Cs, Rb), FeGe exhibits the CDW pattern with an in-plane 2$\times $2 structure and the existence of van Hove singularities (vHSs) near the Fermi level. However, sharply different from AV$_{3}$Sb$_{5}$ which has phonon instability at $M$ point, all the theoretically calculated phonon frequencies in FeGe remain positive. Based on first-principles calculations, we surprisingly find that the maximum of nesting function is at $K$ point instead of $M$ point. Two Fermi pockets with Fe-$d_{xz}$ and Fe-% $d_{x^{2}-y^{2}}$/$d_{xy}$ orbital characters have large contribution to the Fermi nesting, which evolve significantly with $k_{z}$, indicating the highly three-dimensional (3D) feature of FeGe in contrast to AV$_{3}$Sb$_{5}$%. Considering the effect of local Coulomb interaction, we reveal that the instability at $K$ point is significantly suppressed due to the sublattice interference mechanism. Meanwhile, the wave functions nested by vector $M$ have many ingredients located at the same Fe site, thus the instability at $% M $ point is enhanced. This indicates that the electron correlation, rather than electron-phonon interaction, plays a key role in the CDW transition at $% M$ point.

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supporting

confidence: 85%

mentioning

confidence: 99%

Electron-Correlation-Induced Charge Density Wave in FeGe

Wu 武,

Hu 胡,

Fan 樊

et al. 2023

Chinese Phys. Lett.

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“…Rather, the damping observed in TbMn 6 Sn 6 and other FM kagome metals, such as YMn 6 Sn 6 24 and FeSn 25 – 27 , is more consistent with the Landau damping caused by the decay of magnons into particle-hole excitations (Stoner excitations). Recent ab initio calculations for FeSn are consistent with heavy Landau damping for magnons above 80 meV 50 . Supplementary Fig.…”

Section: Discussionmentioning

confidence: 73%

Chiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers

Riberolles,

Slade,

Han

et al. 2024

Nat Commun

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Magnetic kagome metals are a promising platform to develop unique quantum transport and optical phenomena caused by the interplay between topological electronic bands, strong correlations, and magnetic order. This interplay may result in exotic quasiparticles that describe the coupled electronic and spin excitations on the frustrated kagome lattice. Here, we observe novel elementary magnetic excitations within the ferromagnetic Mn kagome layers in TbMn6Sn6 using inelastic neutron scattering. We observe sharp, collective acoustic magnons and identify flat-band magnons that are localized to a hexagonal plaquette due to the special geometry of the kagome layer. Surprisingly, we observe another type of elementary magnetic excitation; a chiral magnetic quasiparticle that is also localized on a hexagonal plaquette. The short lifetime of localized flat-band and chiral quasiparticles suggest that they are hybrid excitations that decay into electronic states.

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