Ordered CoSn-type ternary phases in Co3Sn3−xGex

Allred, Jared M.; Jia, Shuang; Bremholm, Martin; Chan, Benny C.; Cava, R. J.

doi:10.1016/j.jallcom.2012.04.045

Cited by 14 publications

(17 citation statements)

References 23 publications

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“…At room temperature, the Hall resistivity shows linear behavior with respect to the magnetic field with no detectable anomalous Hall effect. This observation is in agreement with the nonmagnetic nature of CoSn . However, as the temperature drops below 10 K, an anomalous Hall effect starts to appear, although the amplitude is no larger than 0.05 μΩ ·cm (see the inset of Figure b).…”

supporting

confidence: 88%

“…This observation is in agreement with the nonmagnetic nature of CoSn. 22 However, as the temperature drops below 10 K, an anomalous Hall effect starts to appear, although the amplitude is no larger than 0.05 μΩ •cm (see the inset of Figure 4b). This tiny anomalous Hall effect was also observed in sputtered thin films, 15 and similar signals were observed in low-temperature magnetization measurements of bulk crystals.…”

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confidence: 95%

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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: 88%

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confidence: 95%

Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands

et al. 2023

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“…[25][26][27][28][29] In FeSn, with spatially decoupled kagome planes, the kagome-derived flat band associated with the observed Dirac band structure is theoretically predicted at 0.5 eV above the Fermi level. 26 The replacement of Co at the transition metal site suppresses the formation of local moments and magnetic ordering in this compound presumably due to a higher d-orbital filling, 30 while, at the same time, shifts the overall band structure below the Fermi energy, so that all kagome-derived electronic excitations (including the flat band) can be accessed by ARPES. Consequently, we could directly visualize the kagomederived flat band as well as the large SOC gap at the quadratic band touching point between Dirac and flat bands, which endows nontrivial topology to the flat band as long predicted theoretically.…”

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confidence: 99%

Topological flat bands in frustrated kagome lattice CoSn

et al. 2020

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Electronic flat bands in momentum space, arising from strong localization of electrons in real space, are an ideal stage to realize strongly-correlated phenomena. Theoretically, the flat bands can naturally arise in certain geometrically frustrated lattices, often with nontrivial topology if combined with spin-orbit coupling. Here, we report the observation of topological flat bands in frustrated kagome metal CoSn, using angle-resolved photoemission spectroscopy and band structure calculations. Throughout the entire Brillouin zone, the bandwidth of the flat band is suppressed by an order of magnitude compared to the Dirac bands originating from the same orbitals. The frustration-driven nature of the flat band is directly confirmed by the chiral d-orbital texture of the corresponding real-space Wannier functions. Spin-orbit coupling opens a large gap of 80 meV at the quadratic touching point between the Dirac and flat bands, endowing a nonzero Z 2 invariant to the flat band. These findings demonstrate that kagome-derived flat bands are a promising platform for novel emergent phases of matter at the confluence of strong correlation and topology.

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“…Experimental quests of topological materials with kagomé lattice have also been carried out. Many of such experimental efforts were stimulated by the prediction of Weyl semimetals [19,20], including intermetallic compounds involving Co [21][22][23][24][25], Fe [26][27][28][29], and Mn [30][31][32], and van-der-Waals compounds [33], as well as optical lattices [34,35]. More recently, the coexistence of superconductivity and nontrivial band topology was reported in a kagomé compound [36][37][38][39].…”

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confidence: 99%

Topological flat bands in a kagomé lattice multiorbital system

Okamoto¹,

Mohanta²,

Dagotto³

et al. 2022

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Flat bands and dispersive Dirac bands are known to coexist in the electronic bands in a twodimensional kagomé lattice. With the relativistic spin-orbit coupling, such systems often exhibit nontrivial band topology, allowing gapless edge modes between flat bands and dispersive bands or at the Dirac band crossing. Here, we theoretically demonstrate that a multiorbital system on a kagomé lattice is a versatile platform to explore the interplay between interaction and nontrivial band topology. When a flat band is 1/3 filled, non-local repulsive interactions further induce a fractional quantum Hall state. We also discuss the possible realization of our findings in real kagomé materials.

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Ordered CoSn-type ternary phases in Co3Sn3−xGex

Cited by 14 publications

References 23 publications

Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands

Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands

Topological flat bands in frustrated kagome lattice CoSn

Topological flat bands in a kagomé lattice multiorbital system

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