Optical spectroscopy and band structure calculations of structural phase transition in the Vanadium-based kagome metal ScV${}_6$Sn${}_6$

Abstract

In condensed matter physics, materials with kagome lattice display a range of exotic quantum states, including charge density wave (CDW), superconductivity and magnetism. Recently, the intermetallic kagome metal ScV6Sn6 was discovered to undergo a first-order structural phase transition with the formation of a root3xroot3x3 CDW at around 92 K. The bulk electronic band properties are crucial to understanding the origin of the structural phase transition. Here, we conducted an optical spectroscopy study in combination with band structure calculations across the structural transition. Our findings showed abrupt changes in the optical reflectivity/conductivity spectra as a result of the structural transition, without any observable gap formation behavior. The optical measurements and band calculations actually reveal a sudden change of the band structure after transition. It is important to note that this phase transition is of the first-order type, which distinguishes it from conventional density-wave type condensations. Our results provide an insight into the origin of the structural phase transition in this new and unique kagome lattice.

9 pages, 6 figures

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Cited by in corpus (29)

• Quantum states and intertwining phases in kagome materials
• Softening of a flat phonon mode in the kagome ScV${}_6$Sn${}_6$
• Competing charge-density wave instabilities in the kagome metal ScV${}_6$Sn${}_6$
• Abundant lattice instability in kagome metal ScV${}_6$Sn${}_6$
• Phonon promoted charge density wave in topological kagome metal ScV${}_6$Sn${}_6$
• Quantum Interactions in Topological R166 Kagome Magnet
• Theory of nematic charge orders in kagome metals
• Frustrated charge order and cooperative distortions in ScV6Sn6
• Quantum oscillations revealing topological band in kagome metal ScV6Sn6
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• Pseudogap behavior in charge density wave kagome material ScV${}_6$Sn${}_6$ revealed by magnetotransport measurements
• Intriguing Low-Temperature Phase in the Antiferromagnetic Kagome Metal FeGe
• Universal sublinear resistivity in vanadium kagome materials hosting charge density waves
• Origin and stability of the charge density wave in ScV${}_6$Sn${}_6$
• Van-Hove annihilation and nematic instability on a Kagome lattice
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• Kagome metals
• Kagome Materials I: SG 191, ScV${}_6$Sn${}_6$. Flat Phonon Soft Modes and Unconventional CDW Formation: Microscopic and Effective Theory
• Low-Energy Electronic Structure in the Unconventional Charge-Ordered State of ScV${}_6$Sn${}_6$
• Order-by-disorder charge density wave condensation at $\text{q}=(\frac{1}{3},\frac{1}{3},\frac{1}{3})$ in kagome metal ScV${}_6$Sn${}_6$
• Ground-state magnetic structures of topological kagome metals RV${}_6$Sn${}_6$ (R = Tb, Dy, Ho, Er)
• Kagome surface states and weak electronic correlation in vanadium-kagome metals
• Infrared spectroscopy study of kagome material CsTi${}_3$Bi${}_5$
• Interlayer charge transfer induced by electronic instabilities in the natural van der Waals hetrostructure 4H${}_b$-TaS${}_2$
• Anomalous Nernst Effect and Its Implications for Time-Reversal Symmetry Breaking in Kagome Metal ScV6Sn6
• Observation of unexpected band splitting and magnetically-induced band structure reconstruction in TbTi${}_3$Bi${}_4$
• Topological Aspects of Dirac Fermions in a Kagomé Lattice
• Pressure suppresses the density wave order in kagome metal LuNb${}_6$Sn${}_6$
• Beyond kagome: $p$-bands in kagome metals