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  • Letter
  • Open Access

Oxygen-isotope effect on the density wave transitions in La3Ni2O7

Rustem Khasanov1,*, Vahid Sazgari1, Igor Plokhikh1,2, Lifen Shi3, KeYuan Ma3, Marisa Medarde1, Ekaterina Pomjakushina1, Tomasz Klimczuk4,5, Thomas J. Hicken1 et al.

Hubertus Luetkens1, Christof W. Schneieder1, Zurab Guguchia1, Sergey Medvedev3, and Dariusz J. Gawryluk1

  • *Contact author: rustem.khasanov@psi.ch
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Phys. Rev. Research 8, L012055 – Published 9 March, 2026

DOI: https://doi.org/10.1103/84hf-dl4p

Abstract

The isotope effect is a powerful probe of electron-phonon interactions in solid-state systems, offering key insights into how atomic mass influences emergent quantum states. Here, the impact of oxygen-isotope substitution (O16→O18) on charge- and spin-density wave (CDW and SDW) transitions in the double-layer Ruddlesden-Popper nickelate La3Ni2O7 is investigated. A clear isotope effect is observed in the CDW transition: the transition temperature increases upon O18 substitution. In contrast, the SDW transition temperature remains unaffected within experimental uncertainty. These findings point to a strong involvement of lattice vibrations in the formation of charge order, while spin order appears to be predominantly of electronic origin. The results suggest that electron-phonon coupling, manifested through the CDW response to isotope substitution, may be relevant to the superconducting pairing mechanism in Ruddlesden-Popper nickelates.

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Pressure and oxygen-isotope substitution on density-wave transitions in La4Ni3O10

Rustem Khasanov, Vahid Sazgari, Thomas J. Hicken, Igor Plokhikh, Marisa Medarde, Ekaterina Pomjakushina, Lukas Keller, Vladimir Pomjakushin, Marek Bartkowiak, Szymon Królak, Michał J. Winiarski, Alexander Steppke, Jonas A. Krieger, Hubertus Luetkens, Tomasz Klimczuk, Christof W. Schneider, Dariusz J. Gawryluk, and Zurab Guguchia
Phys. Rev. Research 8, 013249 (2026)

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Phys. Rev. Research 8, L012055– Published 9 March, 2026
  • Received 18 April 2025
  • Accepted 19 January 2026
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