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Unraveling Spin Density Wave Order in Layered Nickelates $\mathrm{La_3Ni_2O_7}$ and $\mathrm{La_2PrNi_2O_7}$ via Neutron Diffraction

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

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
This is my paper · ORCID
classification cond-mat.supr-concond-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 7 Pith papers

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

  1. Doping evolution of spin excitations in La$_{3-x}$Sr$_{x}$Ni$_2$O$_7$/SrLaAlO$_4$ superconducting thin films

    cond-mat.supr-con 2026-03 conditional novelty 7.0 of 10

    Spin excitations persist with nearly unchanged exchange energy through the superconducting dome of Sr-doped La3Ni2O7 films, then collapse into a damped continuum when superconductivity is lost at x=0.38.

  2. Spin correlations in La$_3$Ni$_2$O$_7$ thin films

    cond-mat.supr-con 2025-02 conditional novelty 7.0 of 10

    RIXS on strained La3Ni2O7 films shows the interlayer exchange Jz is enhanced under compressive strain (superconducting films) and suppressed under tensile strain, supporting spin-fluctuation-mediated interlayer pairing.

  3. Density-wave phases, anisotropic transport, and Planckian dissipation in single crystals of the superconductor La3Ni2O7

    cond-mat.supr-con 2026-07 conditional novelty 6.0 of 10

    In clean La3Ni2O7 single crystals, pressure suppresses two density-wave orders and yields zero-resistance superconductivity from a Planckian T-linear strange metal.

  4. Magnetic Order in bilayer Ruddlesden-Popper Nickelates

    cond-mat.supr-con 2026-07 conditional novelty 6.0 of 10

    Combining superexchange with RKKY interactions between orbital-selective local moments reproduces the (π/2,π/2) magnetic order and ~80 meV spin excitations of bilayer nickelate La₃Ni₂O₇.

  5. Hall Coefficient Sign Reversal Driven by Orbital-Selective Oxygen-Vacancy Scattering in Nickelate Films

    cond-mat.supr-con 2026-07 conditional novelty 6.0 of 10

    In-plane oxygen vacancies selectively suppress d_x2-y2 pocket transport and reverse the Hall coefficient in bilayer nickelate films; rigid-band doping alone cannot.

  6. Electronic Nematicity Revealed by Polarized Ultrafast Spectroscopy in Bilayer La$_3$Ni$_2$O$_7$

    cond-mat.str-el 2026-01 conditional novelty 6.0 of 10

    Bilayer nickelate La3Ni2O7 shows spontaneous two-fold electronic anisotropy (nematicity) below the spin-density-wave transition, whereas trilayer La4Ni3O10 remains isotropic.

  7. Recent progress in nickelate superconductors

    cond-mat.supr-con 2025-09 conditional novelty 2.0 of 10

    A comprehensive review of nickelate superconductors that surveys the 112, 327, and 43(10) families and frames the key open questions about their pairing mechanisms.

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