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arxiv: 2503.05287 · v1 · pith:CHLDSBNF · submitted 2025-03-07 · cond-mat.supr-con · cond-mat.str-el

Unraveling Spin Density Wave Order in Layered Nickelates La₃Ni₂O₇ and La₂PrNi₂O₇ via Neutron Diffraction

Igor Plokhikh , Thomas J. Hicken , Lukas Keller , Vladimir Pomjakushin , Samuel H. Moody , Pascale Foury-Leylekian , Jonas J. Krieger , Hubertus Luetkens
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Zurab Guguchia Rustem Khasanov Dariusz Jakub Gawryluk
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classification cond-mat.supr-con cond-mat.str-el
keywords magneticsuperconductivityla3ni2o7neutronnickelatesbilayercompoundsdiffraction
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The discovery of pressure-induced superconductivity in two- and three-layer Ruddlesden-Popper nickelates has generated significant interest in these materials as a platform for unconventional superconductivity. While their ground state exhibits magnetism, a direct determination of their magnetic structure remains elusive. Understanding this aspect is crucial, as magnetism may play a role in the pairing mechanism of superconductivity in these compounds. We resolve the magnetic structures of the bilayer (2222) polymorphs of La3Ni2O7 and La2PrNi2O7 using neutron powder diffraction (NPD) and muon-spin rotation/relaxation (muSR). Magnetic neutron scattering appears below approximately 150 K in both compounds and is observed at the (qx, 1/2, 0) position, with qx = 0 and 1/2 for La3Ni2O7 and qx = 0 for La2PrNi2O7. Within a single layer, alternating low (0.05 - 0.075 muB) and high (0.66 muB) magnetic moment stripes form. These layers stack antiferromagnetically along the c-direction to form bilayers. The presence of two propagation vectors (qx = 0 and 1/2) in undoped La3Ni2O7 suggests the coexistence of two magnetic stacking polymorphs within a single crystallographic phase. The muSR spectra further confirm these magnetic structures. Our findings provide a detailed understanding of the magnetic ground state in bilayer nickelates, offering insights into possible precursor states that may influence the emergence of superconductivity in these materials.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. High-energy electronic excitations in La3Ni2O7 by time-resolved optical spectroscopy

    cond-mat.supr-con 2026-04 unverdicted novelty 7.0

    Time-resolved optical spectroscopy on La3Ni2O7 reveals two high-energy excitations with density-wave gaps of 54 meV and 67 meV, relaxation via the Rothwarf-Taylor model, and four coherent phonons with distinct electro...

  2. Density waves in low-pressure bilayer nickelates

    cond-mat.str-el 2026-06 unverdicted novelty 6.0

    Unrestricted Hartree-Fock calculations show the second density-wave transition in La3Ni2O7 originates from double-stripe spin order becoming unstable toward a commensurate charge-density wave, yielding intertwined spi...

  3. Nature of magnetism in bilayer nickelate La3Ni2O7 single crystals

    cond-mat.str-el 2026-05 unverdicted novelty 6.0

    Single-crystal neutron scattering establishes stripe antiferromagnetic order with strong interlayer coupling and competing in-plane exchanges in La3Ni2O7, yielding fluctuating moments comparable to cuprates but with l...

  4. Magnetic configurations and excitations in high-$T_{c}$ multilayer nickelates

    cond-mat.supr-con 2026-06 unverdicted novelty 4.0

    Multi-orbital Hartree-Fock calculations identify single-stripe magnetic order in bilayers and mirror-odd SDW in trilayers as consistent with experimental magnetic excitations in multilayer nickelates.

  5. Superconductivity in Ruddlesden-Popper nickelates: a review of recent progress, focusing on thin films

    cond-mat.supr-con 2026-04 unverdicted novelty 2.0

    The review covers experimental and theoretical progress on superconductivity in Ruddlesden-Popper nickelates, emphasizing ambient-pressure thin-film results in La3Ni2O7.