Electronic, magnetic, and thermodynamic properties of the kagome layer compound FeSn

Sales, B. C.; Yan, Jiaqiang; Meier, William R.; Christianson, A. D.; Okamoto, Satoshi; McGuire, Michael A.

doi:10.1103/physrevmaterials.3.114203

Cited by 68 publications

(95 citation statements)

References 32 publications

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“…We have carried out INS experiments to study spin waves and search for anomalous Stoner excitations in AF kagome metallic FeSn 34 and paramagnetic CoSn 35 . The structure of FeSn consists of 2D kagome nets of Fe separated by layers of Sn, and exhibits AF order below ≈ 365 K with in-plane FM moments in each layer stacked antiferromagnetically along the c-axis 34 . Since each unit cell contains three Fe atoms [Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Since each unit cell contains three Fe atoms [Fig. 1(e)], we expect one acoustic and two optical spin-wave branches in a local moment Heisenberg Hamiltonian 34,37,38 . Figures 1(f,g)…”

Section: Resultsmentioning

confidence: 99%

“…the measured magnetic scattering in absolute units, is the neutron energy transfer, and is the Boltzmann's constant. Since the static ordered moment per Fe is ≈ 1.85 at 100 K 34 , the total magnetic moment of FeSn satisfies 0 2 = 2 + 〈 2 〉 ≈ 5.5 2 per Fe, where the local fluctuating moment 〈 2 〉 ≈ 2 2 is obtained by integrating ′′ ( ) at energies below 150 meV.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, a spin-polarized flat electronic band has been identified in the AF kagome metal FeSn at an energy = 230 ±50 meV below the Fermi level by angle-resolved photoemission spectroscopy (ARPES) experiments 25 . FeSn is a A-type AF with antiferromagnetically coupled FM planes 34 , which we will view as 2D ferromagnets. Neutrons should in principle detect the electron-hole-pair Stoner excitations from the majority-spin flat band below the Fermi level to minority-spin bands near or above the Fermi level [Fig.…”

mentioning

confidence: 99%

“…In this paper, we report inelastic neutron scattering (INS) studies of spin excitations in 2D metallic Kagome lattice antiferromagnetic FeSn 34 and paramagnetic CoSn 35 . For FeSn, our initial measurements reveal well-defined spin waves extending well above 140 meV and a narrow ~24 meV wide band of excitations that cannot be described by a simple spin-wave model.…”

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Spin excitations in metallic kagome lattice FeSn and CoSn

Xie

Chen

et al. 2021

Preprint

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In two-dimensional (2D) metallic kagome lattice materials, destructive interference of electronic hopping pathways around the kagome bracket can produce nearly localized electrons, and thus electronic bands that are flat in momentum space. When ferromagnetic order breaks the degeneracy of the electronic bands and splits them into the spin-up majority and spin-down minority electronic bands, quasiparticle excitations between the spin-up and spin-down flat bands should form a narrow localized spin-excitation Stoner continuum coexisting with well-defined spin waves in the long wavelengths. Here we report inelastic neutron scattering studies of spin excitations in 2D metallic Kagome lattice antiferromagnetic FeSn and paramagnetic CoSn, where angle resolved photoemission spectroscopy experiments found spin-polarized and nonpolarized flat bands, respectively, below the Fermi level. Although our initial measurements on FeSn indeed reveal well-defined spin waves extending well above 140 meV coexisting with a flat excitation at 170 meV, subsequent experiments on CoSn indicate that the flat mode actually arises mostly from hydrocarbon scattering of the CYTOP-M commonly used to glue the samples to aluminum holder. Therefore, our results established the evolution of spin excitations in FeSn and CoSn, and identified an anomalous flat mode that has been overlooked by the neutron scattering community for the past 20 years.

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Section: Resultsmentioning

confidence: 99%

“…Since each unit cell contains three Fe atoms [Fig. 1(e)], we expect one acoustic and two optical spin-wave branches in a local moment Heisenberg Hamiltonian 34,37,38 . Figures 1(f,g)…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Spin excitations in metallic kagome lattice FeSn and CoSn

Xie

Chen

et al. 2021

Preprint

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Recent Progress on 2D Kagome Magnets: Binary T_mSn_n (T = Fe, Co, Mn)

Zhang

Feng

et al. 2021

Adv Quantum Tech

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Due to the particularity of the lattice geometry, intriguing electronic characteristics of Dirac cone and flat band can coexist in the two‐dimensional (2D) kagome lattice. The 2D kagome materials, therefore, have attracted tremendous attention, as a platform for studying the topological non‐trivial band structures and strong correlated phenomena. In this paper, the recent experimental progress on binary kagome metals Fe3Sn2, FeSn, CoSn, and Mn3Sn, mainly by the methods of scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS), and angle‐resolved photoemission spectroscopy (ARPES), are reviewed. In those compounds, the kagome layers give rise to the electronic structure of flat bands and Dirac cones, which induce a wide range of novel electron behaviors. Their exposed surface structure, electronic band structure, and topological properties are therefore highlighted, aiming at illustrating the determining role of their 2D kagome layers. In addition, the interplay between frustrated kagome geometry, frustrated magnetism, and topological magnetism, which brings new opportunities and broad prospects to the research of strongly correlated topological kagome magnetic materials, is introduced through reviewing recent experimental works by electronic and magnetic transport measurements.

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