Chemical Control of Magnetism in the Kagome Metal CoSn1 – xInx: Magnetic Order from Nonmagnetic Substitutions

Sales, B. C.; Meier, William R.; Parker, David; Yin, Li; Yan, Jiaqiang; May, Andrew F.; Calder, Stuart; Aczel, A. A.; Zhang, Qiang; Li, Haoxiang; Yilmaz, Turgut; Vescovo, E.; Miao, Hu; Moseley, Duncan H.; Hermann, Raphaël P.; McGuire, Michael A.

doi:10.1021/acs.chemmater.2c01634

Cited by 10 publications

(4 citation statements)

References 42 publications

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“…It is noteworthy that FB1 is reported to be accountable for the anomalous anisotropic transport properties and orbital magnetic moment in bulk CoSn, due to its proximity to the Fermi level . Another work demonstrates that tuning FB1 to the Fermi level through chemical doping induces antiferromagnetic ordering at low temperatures . In our work, FB1 lies just below the Fermi level at the H points, which is promising for tuning across the Fermi level in the near future.…”

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confidence: 57%

Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands

et al. 2023

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Systems with flat bands are ideal for studying strongly correlated electronic states and related phenomena. Among them, kagome-structured metals such as CoSn have been recognized as promising candidates due to the proximity between the flat bands and the Fermi level. A key next step will be to realize epitaxial kagome thin films with flat bands to enable tuning of the flat bands across the Fermi level via electrostatic gating or strain. Here, we report the band structures of epitaxial CoSn thin films grown directly on the insulating substrates. Flat bands are observed by using synchrotron-based angle-resolved photoemission spectroscopy (ARPES). The band structure is consistent with density functional theory (DFT) calculations, and the transport properties are quantitatively explained by the band structure and semiclassical transport theory. Our work paves the way to realize flat bandinduced phenomena through fine-tuning of flat bands in kagome materials.

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confidence: 57%

Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands

et al. 2023

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“…Kagome metals have recently attracted significant interest for their unusual electronic and magnetic properties arising from kagome sheets of transition metals. − A growing number of these materials display a CDW at low temperatures, especially when vanadium forms the kagome net. The AV 3 Sb 5 materials (A = K, Rb, Cs) host both superconductivity and curious CDW phases. − ,− V 3 Sb 2 likely has a CDW transition as well …”

Section: Introductionmentioning

confidence: 99%

Tiny Sc Allows the Chains to Rattle: Impact of Lu and Y Doping on the Charge-Density Wave in ScV₆Sn₆

Meier,

Madhogaria,

Mozaffari

et al. 2023

J. Am. Chem. Soc.

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The kagome metals display an intriguing variety of electronic and magnetic phases arising from the connectivity of atoms on a kagome lattice. A growing number of these materials with vanadium−kagome nets host charge− density waves (CDWs) at low temperatures, including ScV 6 Sn 6 , CsV 3 Sb 5 , and V 3 Sb 2 . Curiously, only the Sc version of the RV 6 Sn 6 materials with a HfFe 6 Ge 6type structure hosts a CDW (R = Gd−Lu, Y, Sc). In this study, we investigate the role of rare earth size in CDW formation in the RV 6 Sn 6 compounds. Magnetization measurements on our single crystals of (Sc,Lu)V 6 Sn 6 and (Sc,Y)V 6 Sn 6 establish that the CDW is suppressed by substituting Sc by larger Lu or Y. Single-crystal X-ray diffraction reveals that compressible Sn−Sn bonds accommodate the larger rare earth atoms within loosely packed R−Sn−Sn chains without significantly expanding the lattice. We propose that Sc provides extra room in these chains crucial to CDW formation in ScV 6 Sn 6 . Our rattling chain model explains why both physical pressure and substitution by larger rare earth atoms hinder CDW formation despite opposite impacts on lattice size. We emphasize the cooperative effect of pressure and rare earth size by demonstrating that pressure further suppresses the CDW in a Lu-doped ScV 6 Sn 6 crystal. Our model not only addresses why a CDW only forms in the RV 6 Sn 6 materials with tiny Sc but also advances our understanding of why unusual CDWs form in the kagome metals.

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“…Two clear motivations are the study of electronic topology and the effects of the large density of states associated with the flat band. Topological and Chern insulating behavior is expected under certain circumstances [7][8][9], and flat bands may provide a way of generating strong electron-electron interactions and correlated ground states [10,11].…”

Section: Introductionmentioning

confidence: 99%

Double-Layer Kagome Metals Pt3Tl2 and Pt3In2

et al. 2023

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The connectivity and inherent frustration of the kagome lattice can produce interesting electronic structures and behaviors in compounds containing this structural motif. Here we report the properties of Pt3X2 (X = In and Tl) that adopt a double-layer kagome net structure related to that of the topologically nontrivial high-temperature ferromagnet Fe3Sn2 and the density wave hosting compound V3Sb2. We examined the structural and physical properties of single crystal Pt3Tl2 and polycrystalline Pt3In2 using X-ray and neutron diffraction, magnetic susceptibility, heat capacity, and electrical transport measurements, along with density functional theory calculations of the electronic structure. Our calculations show that Fermi levels lie in pseudogaps in the densities of states with several bands contributing to transport, and this is consistent with our Hall effect, magnetic susceptibility, and heat capacity measurements. Although electronic dispersions, characteristic of simple kagome nets with nearest-neighbor hopping, are not clearly seen, likely due to the extended nature of the Pt 5d states, we do observe moderately large and non-saturating magnetoresistance values and quantum oscillations in the magnetoresistance and magnetization associated with the kagome nets of Pt.

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Chemical Control of Magnetism in the Kagome Metal CoSn_1 – xIn_x: Magnetic Order from Nonmagnetic Substitutions

Cited by 10 publications

References 42 publications

Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands

Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands

Tiny Sc Allows the Chains to Rattle: Impact of Lu and Y Doping on the Charge-Density Wave in ScV₆Sn₆

Double-Layer Kagome Metals Pt3Tl2 and Pt3In2

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Chemical Control of Magnetism in the Kagome Metal CoSn1 – xInx: Magnetic Order from Nonmagnetic Substitutions

Cited by 10 publications

References 42 publications

Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands

Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands

Tiny Sc Allows the Chains to Rattle: Impact of Lu and Y Doping on the Charge-Density Wave in ScV6Sn6

Double-Layer Kagome Metals Pt3Tl2 and Pt3In2

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Chemical Control of Magnetism in the Kagome Metal CoSn_1 – xIn_x: Magnetic Order from Nonmagnetic Substitutions

Tiny Sc Allows the Chains to Rattle: Impact of Lu and Y Doping on the Charge-Density Wave in ScV₆Sn₆