Frustrated phonon with charge density wave in vanadium Kagome metal

Abstract

The formation of a star of David CDW superstructure, resulting from the coordinated displacements of vanadium ions on a corner sharing triangular lattice, has garnered significant attention to comprehend the influence of electron phonon interaction within geometrically intricate lattice of Kagome metals, specifically AV3Sb5 (where A represents K, Rb, or Cs). However, understanding of the underlying mechanism behind CDW formation, coupled with symmetry protected lattice vibrations, remains elusive. Here, from femtosecond time resolved X ray scattering experiments, we reveal that the phonon mode, associated with Cs ions out-of-plane motion, becomes frustrated in the CDW phase. Furthermore, we observed the photoinduced emergence of a metastable CDW phase, facilitated by alleviating the frustration. By not only elucidating the longstanding puzzle surrounding the intervention of phonons but introducing the phononic frustration, this research offers fresh insights into the competition between phonons and periodic lattice distortions, a phenomenon widespread in other correlated quantum materials including layered high TC superconductors.

arXiv commentManuscript: 23 pages, 4 figures, SI: 17 pages, 11 figures

References in corpus (25)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Discovery of unconventional chiral charge order in kagome superconductor KV3Sb5
• Cascade of correlated electron states in a kagome superconductor CsV3Sb5
• Charge density waves and electronic properties of superconducting kagome metals
• Superconductivity in the ${\mathbb{Z}}_2$ kagome metal KV${}_3$Sb${}_5$
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Superconductivity and normal-state properties of kagome metal RbV3Sb5 single crystals
• Light-Induced Charge Density Wave in LaTe${}_3$
• Theory of the charge-density wave in $A$V${}_3$Sb${}_5$ kagome metals
• Coherent phonon spectroscopy and interlayer modulation of charge density wave order in the kagome metal CsV${}_3$Sb${}_5$
• Charge order landscape and competition with superconductivity in kagome metals
• Coexistence of Tri-Hexagonal and Star-of-David Pattern in the Charge Density Wave of the Kagome Superconductor AV${}_3$Sb${}_5$
• Spatial symmetry constraint of charge-ordered kagome superconductor CsV${}_3$Sb${}_5$
• Conjoined Charge Density Waves in the Kagome Superconductor CsV3Sb5
• Local atomic structure and discommensurations in the charge density wave of CeTe3
• Photoinduced Enhancement of the Charge Density Wave Amplitude
• Order-disorder Peierls instability in the kagome metal (Cs,Rb)V${}_3$Sb${}_5$
• Photoexcitation Induced Quantum Dynamics of Charge Density Wave and Emergence of a Collective Mode in 1T-TaS${}_2$
• Locally commensurate charge-density wave with three-unit-cell periodicity in YBCO
• Ultrafast formation of topological defects in a 2D charge density wave
• Orbital hybridization-driven charge density wave transition in CsV3Sb5 kagome superconductor
• Time-resolved resonant elastic soft X-ray scattering at Pohang Accelerator Laboratory X-ray Free Electron Laser
• Direct Observation of Collective Modes of the Charge Density Wave in the Kagome Metal CsV${}_3$Sb${}_5$