Electronic properties of the topological kagome metals 
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Pokharel, Ganesh; Teicher, Samuel M. L.; Ortiz, Brenden R.; Sarte, Paul M.; Peng, Shuting; He, Junfeng; Seshadri, Ram; Wilson, Stephen D.

doi:10.1103/physrevb.104.235139

Cited by 76 publications

(54 citation statements)

References 54 publications

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“…The agreement with the experimental results indicates that our present calculations are resonable, and the stable structures presented here are likely to be synthesized in future experiments. Very recently, a newly discovered family of kagome metals RV 6 Sn 6 (R = Gd, Ho, Y) with two V-derived kagome layers in the primitive cell was also synthesized by flux method [39,40]. Therefore, the versatile and matured flux method could be employed to synthesize the stable structures in Table S1.…”

Section: N(ef ) (Evmentioning

confidence: 99%

Large kagome family candidates with topological superconductivity and charge density waves

Yi¹,

Ma²,

Zhang³

et al. 2022

Preprint

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A group of newly discovered non-magnetic metal kagome structures AV3Sb5 (A=K, Rb, Cs) have aroused widespread interest in experiment and theory due to their unusual charge density wave (CDW) and intertwined superconductivity. However, they all possess weak electron-phonon coupling (EPC) and low superconducting transition temperature. Here, we performed high-throughput firstprinciples calculations on novel kagome candidates with AV3Sb5 prototype structure, and proposed 24 dynamically stable novel kagome metals. The calculation based on Bardeen-Cooper-Schrieffer theory shows that most of these metals are superconductors with much stronger EPC than the reported AV3Sb5 materials, and their superconducting transition temperatures Tc is between 0.3 and 5.0K. Additionally, several compounds, such as KZr3Pb5 with the highest Tc, are identified as Z2 topological metals with clear Dirac cone topological surface states near Fermi level. NaZr3As5 is shown to have possible CDW phases. Our results provide rich platforms for exploring various new physics with the prototype kagome structure, in which the coexistence of superconductivity and nontrivial topological nature provides promising insights on the discovery of topological superconductors.

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Section: N(ef ) (Evmentioning

confidence: 99%

Large kagome family candidates with topological superconductivity and charge density waves

Yi¹,

Ma²,

Zhang³

et al. 2022

Preprint

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“…An appealing complement to these studies is to explore 166-kagome metals where the magnetic interactions/anisotropies can be tuned independent of the kagome lattice, and to, in turn, control the interplay between magnetic order and the kagome-derived band structure. Specifically, vanadium-based kagome metals of the form RV 6 Sn 6 , are recently identified materials for allowing this interplay [6,26,31]. The presence of topological surface states, Dirac cones, and van Hove singularities near E F in these compounds support the idea of interfacing magnetism with the topological electronic features of the nonmagnetic kagome sublattice.…”

Section: Introductionmentioning

confidence: 98%

“…The exploration of correlated topological electronic states born from the interplay between lattice geometries/nontrivial band topologies and electron-electron interactions is an active frontier of condensed matter physics research [1][2][3][4][5][6][7][8][9][10]. Transition-metal-based kagome metals have attracted particular attention due to their natural potential to host topologically nontrivial electronic states and a wide variety of electronic correlations.…”

Section: Introductionmentioning

confidence: 99%

“…within kagome metals seemingly validates their promise as hosts of a rich frontier of unconventional ground states and phase behaviors. In particular, kagome metals that crystallize in the MgFe 6 Ge 6 structural prototype, or 166-kagome metals, have recently been proposed as a chemically flexible route for exploring the interplay between topology, correlations and magnetism [5,6,10,[20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…The presence of topological surface states, Dirac cones, and van Hove singularities near E F in these compounds support the idea of interfacing magnetism with the topological electronic features of the nonmagnetic kagome sublattice. While R=Gd has been shown to manifest a nearly ferromagnetic, relatively isotropic magnetic state [6], exploring other variants with differing anisotropies, such as the typically uniaxial Tb ion, remains unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Highly anisotropic magnetism in the vanadium-based kagome metal TbV6Sn6

Pokharel¹,

Ortiz²,

Sarte³

et al. 2022

Preprint

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RV 6 Sn 6 (R=rare earth) compounds are appealing materials platforms for exploring the interplay between R-site magnetism and nontrivial band topology associated with the nonmagnetic vanadium-based kagome network. Here we present the synthesis and characterization of the kagome metal TbV 6 Sn 6 via single crystal x-ray diffraction, magnetization, transport, and heat capacity measurements. Magnetization measurements reveal strong, uniaxial magnetic anisotropy rooted in the alignment of Tb 3+ moments in the interplane direction below 4.3(2) K. TbV 6 Sn 6 exhibits multiband transport behavior with high mobilities of charge carriers, and our measurements suggest TbV 6 Sn 6 is a promising candidate for hosting Chern gaps driven via the interplay between Tb-site magnetic order and the band topology of the V-site kagome network.

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Realization of Z₂ Topological Metal in Single‐Crystalline Nickel Deficient NiV₂Se₄

et al. 2023

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Temperature-dependent electronic and magnetic properties are reported for nickel-deficient NiV 2 Se 4 . Single-crystal X-ray diffraction shows it to crystallize in the monoclinic Cr 3 S 4 structure type with space group I2∕m and vacancies on the Ni site, resulting in the composition Ni 0.85 V 2 Se 4 in agreement with our electron-probe microanalysis. Structural distortions are not observed down to 1.5 K. Nevertheless, the electrical resistivity shows metallic behavior with a broad anomaly around 150-200 K that is also observed in the heat capacity data. This anomaly indicates a change of state of the material below 150 K. It is believed that this anomaly could be due to spin fluctuations or charge-density-wave fluctuations, where the lack of long-range order is caused by vacancies at the Ni site of Ni 0.85 V 2 Se 4 . The non-linear temperature dependence of the resistivity as well as an enhanced value of the Sommerfeld coefficient 𝜸 = 104.0 (1) mJ mol −1 K −2 suggest strong electron-electron correlations in this material. First-principles calculations performed for NiV 2 Se 4 , which are also applicable to Ni 0.85 V 2 Se 4 , classify this material as a topological metal with Z 2 = (1; 110) and coexisting electron and hole pockets at the Fermi level. The phonon spectrum lacks any soft phonon mode, consistent with the absence of periodic lattice distortion in the present experiments.

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Electronic properties of the topological kagome metals YV6Sn6 and GdV6Sn6

Cited by 76 publications

References 54 publications

Large kagome family candidates with topological superconductivity and charge density waves

Large kagome family candidates with topological superconductivity and charge density waves

Highly anisotropic magnetism in the vanadium-based kagome metal TbV6Sn6

Realization of Z₂ Topological Metal in Single‐Crystalline Nickel Deficient NiV₂Se₄

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Electronic properties of the topological kagome metals YV6Sn6 and GdV6Sn6

Cited by 76 publications

References 54 publications

Large kagome family candidates with topological superconductivity and charge density waves

Large kagome family candidates with topological superconductivity and charge density waves

Highly anisotropic magnetism in the vanadium-based kagome metal TbV6Sn6

Realization of Z2 Topological Metal in Single‐Crystalline Nickel Deficient NiV2Se4

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Product

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Realization of Z₂ Topological Metal in Single‐Crystalline Nickel Deficient NiV₂Se₄