Origin and stability of the charge density wave in ScV${}_6$Sn${}_6$

Abstract

Kagome metals are widely recognized as versatile platforms for exploring novel topological properties, unconventional electronic correlations, magnetic frustration, and superconductivity. In the $R$V${}_6$Sn${}_6$ family of materials ($R$ = Sc, Y, Lu), ScV${}_6$Sn${}_6$ hosts an unusual charge density wave ground state as well as structural similarities with the $A$V${}_3$Sb${}_5$ 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 ScV${}_6$Sn${}_6$. 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 $P$6/$mmm$ and $R$$\bar{3}$$m$ 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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Cited by in corpus (11)

• Quantum oscillations revealing topological band in kagome metal ScV6Sn6
• Universal sublinear resistivity in vanadium kagome materials hosting charge density waves
• FeGe as a building block for the kagome 1:1, 1:6:6, and 1:3:5 families: hidden d-orbital decoupling of flat band sectors, effective models and interaction Hamiltonians
• Kagome metals
• Kagome Materials I: SG 191, ScV${}_6$Sn${}_6$. Flat Phonon Soft Modes and Unconventional CDW Formation: Microscopic and Effective Theory
• Electronic band structures of topological kagome materials
• 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${}_6$
• Instability of the charge density wave in Kagome magnet FeGe
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• Reaching Quantum Critical Point by Adding Non-magnetic Disorder in Single Crystals of Superconductor $({\text{Ca}}_x{\text{Sr}}_{1-x}{)}_3{\text{Rh}}_4{\text{Sn}}_{13}$