Nature of charge density wave in kagome metal ScV6Sn6

Journal Article · 29 January 2024 · npj Quantum Materials

DOI: https://doi.org/10.1038/s41535-024-00620-y · OSTI ID:2283134

Lee, Seongyong; Won, Choongjae ; Kim, Jimin ; Yoo, Jonggyu; Park, Sudong; Denlinger, Jonathan ; Jozwiak, Chris ; Bostwick, Aaron ; Rotenberg, Eli ; Comin, Riccardo; Kang, Mingu; Park, Jae-Hoon

Abstract Recently, kagome lattice materials have emerged as a new model material platform for discovering and engineering novel quantum phases of matter. In this work, we elucidate the driving mechanism of the $$$$\sqrt{{{3}}}$$$$ $\sqrt{3}$ × $$$$\sqrt{{{3}}}$$$$ $\sqrt{3}$ charge order in a newly discovered kagome metal ScV ₆ Sn ₆ . Through multimodal investigations combining angle-resolved photoemission spectroscopy, phonon dispersion calculations, and phase diagram study, we identify the central role of unstable planar Sn and Sc phonon modes, while the electronic instability and van Hove singularities originating from the V kagome lattice have a marginal influence. Our results highlight that the $$$$\sqrt{{{3}}}$$$$ $\sqrt{3}$ × $$$$\sqrt{{{3}}}$$$$ $\sqrt{3}$ charge order in ScV ₆ Sn ₆ is fundamentally distinguished from the electronically driven 2 × 2 charge order in the canonical kagome system AV ₃ Sb ₅ , uncovering a new mechanism to induce symmetry-breaking phase transition in kagome lattice materials.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Korean Ministry of Science and Information and communication Technology (ICT); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 2283134
• Journal Information: npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 9; ISSN 2397-4648
• Publisher: Nature Publishing GroupCopyright Statement
• Country of Publication: United Kingdom
• Language: English