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Fermi-surface driven frustrations in charge ordered kagome metal LuNb6⁢Sn6

Journal Article · · Physical Review. B
DOI:https://doi.org/10.1103/6yk1-19mn· OSTI ID:3007917
 [1];  [2];  [3];  [4];  [4];  [2];  [2];  [4];  [4];  [4];  [5];  [6];  [6];  [1];  [2];  [7];  [1]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. Columbia Univ., New York, NY (United States)
  3. Weizmann Institute of Science, Rehovot (Israel)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  5. Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  6. The University of Tennessee
  7. Weizmann Institute of Science, Rehovot (Israel); Pennsylvania State Univ., University Park, PA (United States)
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The charge density wave (CDW), a translational symmetry breaking electronic liquid, plays a pivotal role in correlated quantum materials, such as high-𝑇𝑐 superconductors and topological semimetals. Recently, CDWs that possibly intertwine with superconductivity and magnetism are observed in various kagome metals. However, the nature of CDWs and the role of the Fermi-surface (FS) topology in these materials remain an unresolved challenge. In this paper, we reveal the formation of CDWs in the newly discovered kagome metal LuNb6⁢Sn6. Here, we observe a ‘‘yield sign’’-like hollow triangular diffuse scattering pattern and nearly complete softening of a flat optical phonon band near 𝐐𝐻 = (1/3,1/3,1/2). The scattering intensity of the diffuse scattering displays divergent behavior as decreasing temperature until 𝑇CDW = 70 K, where a competing CDW at 𝑄CDW = (1/3,1/3,1/3) emerges. Combined with scanning tunneling microscopy/spectroscopy and first-principles calculations, our observations support a Fermi-surface driven frustration that suppresses the leading CDW instability at 𝐐𝐻. This frustration is relieved by the emergence of a subleading CDW at 𝑄CDW. These results provide insights into the interplay between the Fermi surface, strong electron-phonon coupling, and charge density wave formation in quantum materials.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); Gordon and Betty Moore Foundation (GBMF); National Science Foundation (NSF)
Grant/Contract Number:
SC0012704; AC05-00OR22725
OSTI ID:
3007917
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 24 Vol. 112; ISSN 2469-9950; ISSN 2469-9969
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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