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 electronic couplings and softening behavior.
Plokhikh et al., Unraveling spin density wave order in layered nickelates La3Ni2O7 and La2PrNi2O7 via neutron diffraction, arXiv:2503.05287 (2025)
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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 spin-modulated order.
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 lower bandwidth.
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.
The review covers experimental and theoretical progress on superconductivity in Ruddlesden-Popper nickelates, emphasizing ambient-pressure thin-film results in La3Ni2O7.
citing papers explorer
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Density waves in low-pressure bilayer nickelates
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 spin-modulated order.
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Nature of magnetism in bilayer nickelate La3Ni2O7 single crystals
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 lower bandwidth.