fRG calculations on bilayer nickelate models show that approaching the tetragonal limit makes SDW fluctuations degenerate, frustrating magnetic order and enhancing superconductivity, identifying lattice symmetry as the central tuning parameter.
Nature of magnetism in bilayer nickelate La3Ni2O7 single crystals
4 Pith papers cite this work. Polarity classification is still indexing.
4
Pith papers citing it
abstract
The recent discovery of high-temperature superconductivity in pressurized and thin film nickelates has generated intense interest, yet the nature of magnetism in their ambient-pressure parent phases remains poorly understood, despite its potentially crucial role in pairing. Here we use neutron scattering to resolve the spin order and dynamics of single-crystalline La3Ni2O7, an ambient-pressure parent of this class. Well defined spin excitations are observed at Q = (0, 0.5, 2.5), featuring a~5 meV spin gap and anisotropic in-plane dispersions, with zone-boundary softening along the transverse direction indicative of competing exchange interactions. The excitations exhibit pronounced out-of-plane modulations with bilayer periodicity, providing direct evidence for antiferromagnetic interlayer coupling. Their dispersion is well described by a bilayer Heisenberg Hamiltonian with strong interlayer exchange and competing in-plane couplings within a stripe-type magnetic order. Normalization of the spectra to absolute units reveals that, although the spin-wave bandwidth is only about 25% of that in cuprates, the local dynamic susceptibility at comparable energies is significantly enhanced, yielding a total fluctuating moment of comparable magnitude. These results highlight intense mid-energy spin excitations rooted in substantial electronic correlations as a defining feature of this family, establishing a magnetic framework distinct from cuprates and directly relevant to understanding superconductivity in this system.
years
2026 4verdicts
UNVERDICTED 4representative citing papers
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.
A mirror-selective itinerant SDW model unifies magnetic order and excitations in Ruddlesden-Popper nickelates as fundamentally itinerant rather than local-moment.
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.
citing papers explorer
-
Structural symmetry effects on the competition of density waves and superconductivity in bilayer nickelates
fRG calculations on bilayer nickelate models show that approaching the tetragonal limit makes SDW fluctuations degenerate, frustrating magnetic order and enhancing superconductivity, identifying lattice symmetry as the central tuning parameter.
-
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.
-
Itinerant Nature of Spin-Density-Wave Order in Ruddlesden-Popper Nickelates
A mirror-selective itinerant SDW model unifies magnetic order and excitations in Ruddlesden-Popper nickelates as fundamentally itinerant rather than local-moment.
-
Magnetic configurations and excitations in high-$T_{c}$ multilayer nickelates
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.