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We performed de Haas–van Alphen (dHvA) oscillation measurements and band-structure calculations for YNi₂B₂C. Our improved band structure successfully explained the origins of the large dHvA frequencies β and ζ, which were inexplicable in previous works. By comparing experimental effective masses with band masses, we determined the electron–phonon coupling for each orbit. The results showed a clear Fermi-surface-sheet dependence of the electron–phonon coupling strength, especially highlighting that the coupling for the band-28 sheet is very weak, almost absent for the orbit with B ∥ c. This finding is consistent with previous observations of dHvA oscillations from this orbit in the mixed state down to very low fields. Amid growing interest in high-temperature superconductivity driven by electron–phonon coupling in hydrides under high pressure, this Letter provides foundational data pivotal to precisely understanding electron–phonon coupling.

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• In Copyright
  

  © 2026 American Physical Society

Keyword: electron-phonon coupling, YNi2B2C, de Haas-van Alphen effect

Date published: 2026-07-31

Publisher: American Physical Society (APS)

Journal:

• Physical Review Letters (ISSN: 00319007) vol. 137 issue. 5 056003

Funding:

• Japan Society for the Promotion of Science JP22K03537
• Japan Society for the Promotion of Science JP24K00587
• Ministry of Education, Culture, Sports, Science and Technology World Premier International Research Center Initiative

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6436

First published URL: https://doi.org/10.1103/m6r6-vpdg

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Updated at: 2026-08-03 11:40:29 +0900

Published on MDR: 2026-08-03 14:30:23 +0900