Destabilization of the Charge Density Wave and the Absence of Superconductivity in ScV6Sn6 under High Pressures up to 11 GPa

Zhang, Xiaoxiao; Hou, Jinyu; Xia, Wei; Xu, Zhian; Yang, Pengtao; Wang, An-Qi; Liu, Ziyi; Shen, Jie; Zhang, Hua; Dong, Xianlin; Uwatoko, Yoshiya; Sun, J. P.; Wang, Bosen; Guo, Yanfeng; Cheng, Jinguang

doi:10.3390/ma15207372

Cited by 28 publications

(24 citation statements)

References 57 publications

(57 reference statements)

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“…The measurement was performed in a Quantum Design physical property measurement system (PPMS). Good metallic behavior is observed in resistivity measurements (shown in Figure 1 All the sample fundamental characterizations are identified with the previous report 24,25 .…”

Section: Resultssupporting

confidence: 86%

“…X-ray diffraction verified that an extra three-dimensional 3×3×3 periodic CDW lattice modulation forms below this temperature. High-pressure transport measurements indicate that the CDW order can be suppressed completely but no SC emerges yet under high pressures up to 11 GPa 25 . Unlike AV 3 Sb 5 systems, there are two kagome sheets per unit cell separated by alternating ScSn 2 and Sn 2 lay-ers in ScV 6 Sn 6 .…”

Section: Introductionmentioning

confidence: 97%

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Optical studies of structural phase transition in the vanadium-based kagome metal ScV6Sn6

Hu¹,

Xu²,

Li³

et al. 2022

Preprint

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In condensed matter physics, materials with kagome lattice exhibit exotic emergent quantum states, including charge density wave (CDW), superconductivity and magnetism. Very recently, hexagonal kagome metal ScV 6 Sn 6 was found to undergo fascinating first-order structural phase transition at around 92 K and a 3×3×3 CDW modulation. The bulk electronic band properties are enlightened for comprehending the origin of the structural phase transition. Here, we perform a optical spectroscopy study on the monocrystalline compound across the transition temperature. The structural transition gives rise to the abrupt changes of optical spectra without observing gap development behavior. The optical measurements revealed a sudden reconstruction of the band structure after transition. We emphasize that the phase transition is of the first order and distinctly different from the conventional density-wave type condensation. Our results provide insight into the origin of the structural phase transition in the new kagome metal compound.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 97%

Optical studies of structural phase transition in the vanadium-based kagome metal ScV6Sn6

Hu¹,

Xu²,

Li³

et al. 2022

Preprint

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“…Furthermore, it is interesting to consider whether the competition between CDW instabilities in ScV 6 Sn 6 could be tilted in favor of q * -CDW via external tuning. In this regard, electrical transport measurements in pressurized ScV 6 Sn 6 reveal that the sharp drop in resistivity associated with q s -CDW persists up to ∼ 2.0 GPa, beyond which it is suddenly replaced by a much weaker kink in resistivity, before becoming fully suppressed at ∼ 2.4 GPa [49]. The sudden qualitative change in resistivity anomaly above ∼ 2.0 GPa is suggestive of a change in the ground state, and the much less pronounced resistivity anomaly between ∼ 2.0 GPa and ∼ 2.4 GPa suggests the associated transition being second-order.…”

Section: Discussionmentioning

confidence: 97%

Competing charge-density wave instabilities in the kagome metal ScV6Sn6

Song

Cao

et al. 2023

Preprint

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Owing to its unique geometry, the kagome lattice hosts various many-body quantum states including frustrated magnetism, superconductivity, charge-density waves (CDWs), and topologically nontrivial phases of matter. Kagome metals with 2×2 CDWs, corresponding to the nesting of van Hove saddle points, are found to exhibit a number of exotic electronic phases, and have been the focus of much recent research. More recently, a √3×√3 CDW was discovered in the kagome metal ScV6Sn6 below TCDW≈91 K, whose underlying mechanism and formation process remain unclear, particularly in comparison with the 2×2 kagome CDWs. Using inelastic X-ray scattering, we discover a short-range √3×√3×2 CDW that is dominant in ScV6Sn6 well above TCDW, distinct from the √3×√3×3 CDW below TCDW. The short-range CDW grows upon cooling, and is accompanied by the softening of phonons, indicative of its dynamic nature. As the √3×√3×3 CDW appears, the short-range CDW becomes suppressed, revealing a competition between these CDW instabilities. The competing CDW instabilities in ScV6Sn6 lead to an unusual CDW formation process, with the most pronounced phonon softening and the static CDW occurring at different wavevectors. Our first-principles calculations indicate that the √3×√3×2 CDW is energetically favored, consistent with experimental observations at high temperatures. However, the √3×√3×3 CDW is selected as the ground state due to a large wavevector-dependent electron-phonon coupling (EPC), which also accounts for the enhanced electron scattering above TCDW. Our findings reveal the dominance of EPC-driven correlated many-body physics in ScV6Sn6, making it an ideal system to study emergent quantum matter in the strong EPC regime.

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“…GPa due to destabilization and disappearance of the CDW. 24 It is tempting to claim that this destabilization corresponds to P C,1 , but we must remember that our measurements are performed at room temperature -where the CDW is not fully developed. The recently reported short range CDW provides a way forward.…”

Section: Resultsmentioning

confidence: 97%

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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Destabilization of the Charge Density Wave and the Absence of Superconductivity in ScV6Sn6 under High Pressures up to 11 GPa

Cited by 28 publications

References 57 publications

Optical studies of structural phase transition in the vanadium-based kagome metal ScV6Sn6

Optical studies of structural phase transition in the vanadium-based kagome metal ScV6Sn6

Competing charge-density wave instabilities in the kagome metal ScV6Sn6

Origin and stability of the charge density wave in ScV6Sn6

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