Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals

Cheng, Siyu; Zheng, Rong; Li, Hong; Oh, Jiseop; Tan, Hengxin; Pokharel, Ganesh; DeStefano, Jonathan M.; Rosenberg, Elliott; Guo, Yucheng; Zhang, Yichen; Yue, Ziqin; Lee, Yongbin; Gorovikov, Sergey; Zonno, Marta; Hashimoto, Makoto; Lü, Donghui; Ke, Liqin; Mazzola, Federico; Kono, Junichiro; Birgeneau, R. J.; Chu, Jiun‐Haw; Wilson, Stephen D.; Wang, Ziqiang; Yan, Binghai; Yi, Ming; Zeljkovic, Ilija

doi:10.48550/arxiv.2302.12227

Cited by 7 publications

(5 citation statements)

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“…1a). Similar to the sister compound GdV6Sn6, ScV6Sn6 tends to cleave along the c-axis, resulting in three surface terminations, namely the kagome, ScSn 3 2 and Sn 2 layers [31,32]. The electrical resistivity [Fig.…”

Section: Charge Density Wave (Cdw) Orders In Vanadium-mentioning

confidence: 99%

Phonon promoted charge density wave in topological kagome metal ScV6Sn6

et al. 2023

Preprint

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Charge density wave (CDW) orders in vanadium-based kagome metals have recently received tremendous attention due to their unique properties and intricate interplay with exotic correlated phenomena, topological and symmetry-breaking states. However, the origin of the CDW order remains a topic of debate. The discovery of ScV6Sn6, a vanadium-based bilayer kagome metal exhibiting an in-plane √3 x√3 R30° CDW order with time-reversal symmetry breaking, provides a novel platform to explore the underlying mechanism behind the unconventional CDW. Here, we combine high-resolution angle-resolved photoemission spectroscopy, Raman scattering measurements and density functional theory to investigate the electronic structures and phonon modes of ScV6Sn6 and their evolution with temperature. We identify topologically nontrivial Dirac surface states and multiple van Hove singularities (VHSs) in the vicinity of the Fermi level, with one VHS near the ꝁ point exhibiting nesting wave vectors in proximity to the √3 x√3 R30° CDW wave vector. Additionally, Raman measurements indicate a strong intrinsic electron-phonon coupling in ScV6Sn6, as evidenced by the presence of a two-phonon mode and a large frequency amplitude mode. Our findings highlight the fundamental role of lattice degrees of freedom in promoting the CDW in ScV6Sn6 and provide important insights into the fascinating correlation phenomena observed in kagome metals.

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Section: Charge Density Wave (Cdw) Orders In Vanadium-mentioning

confidence: 99%

Phonon promoted charge density wave in topological kagome metal ScV6Sn6

et al. 2023

Preprint

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“…Recent studies of RV 6 Sn 6 have revealed kagome surface states and topological surface states [27][28][29][30]. ScV 6 Sn 6 has been extensively studied as the only compound among the series of RV 6 Sn 6 that displays a CDW order [31][32][33][34][35][36][37][38]. However, whether kagome surface states can be affected by different R elements has not been systematically studied.…”

Section: Introductionmentioning

confidence: 99%

Kagome surface states and weak electronic correlation in vanadium-kagome metals

Ding

Liu

Zhao

et al. 2023

J. Phys.: Condens. Matter

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RV6Sn6 (R = Y and lanthanides) with two-dimensional vanadium-kagome surface states is an ideal platform to investigate kagome physics and manipulate the kagome features to realize novel phenomena. Utilizing the micron-scale spatially resolved angle-resolved photoemission spectroscopy and ﬁrst-principles calculations, we report a systematical study of the electronic structures of RV6Sn6 (R = Gd, Tb, and Lu) on the two cleaved surfaces, i.e., the V- and RSn1-terminated (001) surfaces. The calculated bands without any renormalization match well with the main ARPES dispersive features, indicating the weak electronic correlation in this system. We observe ’W’-like kagome surface states around the Brillouin zone corners showing R-element-dependent intensities, which is probably due to various coupling strengths between V and RSn1 layers. Our ﬁnding suggests an avenue for tuning electronic states by interlayer coupling based on two-dimensional kagome lattices.

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“…Since the phonon mode near 240 cm −1 also serves to connect the short-range and long-range CDWs, it provides a sensitive, microscopic indicator of CDW stability under different tuning parameters. Finally, we point out that while prior phonon dispersion calculations emphasize the role of unstable Sn and Sc modes in the CDW state, 33 this and other work 25,64,66 is revealing that the V centers are not just spectators. Rather, the out-of-plane motion of V in the double kagomé layer is just as significant as the Sc and Sn center motion.…”

Section: Resultsmentioning

confidence: 72%

“…In this family of materials, most of the focus so far has been on electronic properties from the point of view of electron-phonon coupling and Fermi surface nesting. 38,[63][64][65][66] There has been significantly less effort to uncover the vibrational contribution to the development of the density wave state. This is because metallic character in both high and low temperature phases of ScV 6 Sn 6 prevents us from revealing the behavior of the infrared-active phonons due to screening by the Drude peak.…”

Section: Resultsmentioning

confidence: 99%

Origin and stability of the charge density wave in ScV6Sn6

Musfeldt

2023

Preprint

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Kagom′e metals are widely recognized as versatile platforms for exploring novel topological properties, unconventional electronic correlations, magnetic frustration, and superconductivity. In the RV6Sn6 family of materials (R = Sc, Y, Lu), ScV6Sn6 hosts an unusual charge density wave ground state as well as structural similarities with the AV3Sb5 system (A = K, Cs, Rb). In this work, we combine Raman scattering spectroscopy with first-principles lattice dynamics calculations to reveal the charge density wave state in ScV6Sn6. In the low temperature phase, we find a five-fold splitting of the V-containing totally symmetric mode near 240 cm-1 suggesting that the density wave acts to mix modes of P6/mmm and R-3m symmetry - an effect that we quantify by projecting phonons of the high symmetry state onto those of the lower symmetry structure. We also test the stability of the density wave state under compression and find that both physical and chemical pressure act to quench the effect. We discuss these findings in terms of symmetry and the structure-property trends that can be unraveled in this system.

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Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals

Cited by 7 publications

References 0 publications

Phonon promoted charge density wave in topological kagome metal ScV6Sn6

Phonon promoted charge density wave in topological kagome metal ScV6Sn6

Kagome surface states and weak electronic correlation in vanadium-kagome metals

Origin and stability of the charge density wave in ScV6Sn6

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