Fermi level tuning and double-dome superconductivity in the kagome metal 
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Oey, Yuzki M.; Ortiz, Brenden R.; Kaboudvand, Farnaz; Frassineti, Jonathan; Garcia, Erick; Cong, Rong; Sanna, Samuele; Mitrović, Vesna; Seshadri, Ram; Wilson, Stephen D.

doi:10.1103/physrevmaterials.6.l041801

Cited by 90 publications

(21 citation statements)

References 34 publications

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“…As shown in Figs. 4a and 1a , T c of CsV 3 Sb 5 is increased with chemical substitutions or external pressure 32 – 35 . We thus continue to examine the EPC in a 7% Nb-doped Cs(V 0.93 Nb 0.07 ) 3 Sb 5 with T c ~4.4 K 34 .…”

Section: Resultsmentioning

confidence: 99%

Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5

Zhong

Liu

et al. 2023

Nat Commun

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In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in a new kagome metal CsV3Sb5, superconductivity that possibly intertwines with time-reversal and spatial symmetry-breaking orders is observed. Density functional theory calculations predicted weak EPC strength, λ, supporting an unconventional pairing mechanism in CsV3Sb5. However, experimental determination of λ is still missing, hindering a microscopic understanding of the intertwined ground state of CsV3Sb5. Here, using 7-eV laser-based angle-resolved photoemission spectroscopy and Eliashberg function analysis, we determine an intermediate λ=0.45–0.6 at T = 6 K for both Sb 5p and V 3d electronic bands, which can support a conventional superconducting transition temperature on the same magnitude of experimental value in CsV3Sb5. Remarkably, the EPC on the V 3d-band enhances to λ~0.75 as the superconducting transition temperature elevated to 4.4 K in Cs(V0.93Nb0.07)3Sb5. Our results provide an important clue to understand the pairing mechanism in the kagome superconductor CsV3Sb5.

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Section: Resultsmentioning

confidence: 99%

Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5

Zhong

Liu

et al. 2023

Nat Commun

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“…Although KV 3 Sb 5 , RbV 3 Sb 5 , CsV 3 Sb 5 compounds have generated significant excitement, the family is quite small [22] (despite proposed variants [63]). Doping opportunities are also limited to Ti for V [64] and Sn for Sb [39]. In contrast, the RM 6 X 6 compounds of the HfFe 6 Ge 6 family are far more diverse [41] offering many different options for tuning the CDW in ScV 6 Sn 6 to uncover what factors influence charge order and superconductivity in kagome metals.…”

Section: Discussionmentioning

confidence: 99%

“…The origin of the CDW is closely tied to van Hove singularities at Fermi level [26][27][28][29]. The unusual characteristic of the CDW [23,27,[30][31][32][33][34][35]] and it's interaction with superconductivity [36][37][38][39] have sparked great interest in kagome lattice derived charge order [40].…”

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confidence: 99%

Charge density wave in kagome lattice intermetallic ScV6Sn6

Arachchige,

Meier,

Marshall

et al. 2022

Preprint

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Charge density waves (CDWs) and superconductivity originating from electronic correlations in stacked kagome layers have drawn interest following the discovery of curious low temperature phases in AV3Sb5 compounds (A = K, Rb, Cs). Here we report single-crystal growth and characterization of ScV6Sn6, a hexagonal HfFe6Ge6-type compound that shares this structural motif. We identify a first-order phase transition at 92 K. Single crystal X-ray diffraction reveals a charge density wave modulation of the atomic lattice below this temperature which enlarges the unit cell 9-fold. This is a distinctly different structural mode than that observed in the AV3Sb5 compounds, but both modes have been anticipated in kagome metals. The diverse HfFe6Ge6 family offers more opportunities to tune ScV6Sn6 and explore density wave order in kagome lattice materials. a

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“…Both superconductivity and CDW in AV 3 Sb 5 can be tuned by external pressure 19 , 20 , 53 , 54 , chemical pressure 55 , and doping 56 . The kagome metals exhibit superconducting domes under either pressure or doping, but the CDW order is always significantly suppressed by pressure or doping, under which it vanishes abruptly 19 , 20 , 53 – 56 . In thin flakes, the dimension reduction does not only introduce charge modulations but also boosts quantum fluctuations and electronic correlations.…”

Section: Introductionmentioning

confidence: 99%

Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit

Song

Ying

et al. 2023

Nat Commun

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The recently discovered kagome metals AV3Sb5 (A = Cs, Rb, K) exhibit a variety of intriguing phenomena, such as a charge density wave (CDW) with time-reversal symmetry breaking and possible unconventional superconductivity. Here, we report a rare non-monotonic evolution of the CDW temperature (TCDW) with the reduction of flake thickness approaching the atomic limit, and the superconducting transition temperature (Tc) features an inverse variation with TCDW. TCDW initially decreases to a minimum value of 72 K at 27 layers and then increases abruptly, reaching a record-high value of 120 K at 5 layers. Raman scattering measurements reveal a weakened electron-phonon coupling with the reduction of sample thickness, suggesting that a crossover from electron-phonon coupling to dominantly electronic interactions could account for the non-monotonic thickness dependence of TCDW. Our work demonstrates the novel effects of dimension reduction and carrier doping on quantum states in thin flakes and provides crucial insights into the complex mechanism of the CDW order in the family of AV3Sb5 kagome metals.

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Fermi level tuning and double-dome superconductivity in the kagome metal CsV3Sb5−xSnx

Cited by 90 publications

References 34 publications

Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5

Testing electron–phonon coupling for the superconductivity in kagome metal CsV3Sb5

Charge density wave in kagome lattice intermetallic ScV6Sn6

Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit

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