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.
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Epitaxially stabilized Pr3Ni2O7 films show pressure-induced superconductivity with onset Tc of 66 K at 22 GPa, while the Nd analog does not superconduct in the accessed pressure range.
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.
Superconductivity in bilayer nickelates emerges only when coherent interlayer d_z2-p_z-d_z2 hybridization develops, suppressing static spin-density-wave order and damping spin excitations.
Varying the Ni-Ni interlayer distance switches La3Ni2O7/LaAlO3 films between C-type and G-type spin density waves, with s± superconductivity emerging in between.
s±-wave pairing in La3Ni2O7 thin films is robust across different crystal structures, and the halved transition temperature is reproduced only when the experimentally determined structure with small interlayer hopping is used.
First-principles calculation shows selective excitation of an IR phonon mode in La3Ni2O7 produces a small nonlinear shift that moves the Ni-O-Ni bond angle closer to 180 degrees.
Position-dependent STM spectra in La2PrNi2O7 are computed from a two-orbital bilayer model, showing orbital-selective coherence peaks and impurity scattering that enable band identification.
DFT-based tight-binding models and FRG calculations predict that reducing in-plane lattice constant or increasing out-of-plane constant in La3Ni2O7 films increases Fermi-level DOS and enhances Tc while preserving s± pairing.
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.
Dynamical singlets from 3z²-r² orbitals hybridized with x²-y² orbitals control the distinct pressure versus strain responses in bilayer nickelates.
Superconductivity in La3Ni2O7 arises from interlayer Cooper pairs of 3d_x2-y2 electrons driven by effective J_perp from Hund-assisted AFM exchange transfer, while localized 3d_z2 electrons form rung singlets that produce a pseudogap but no condensate.
citing papers explorer
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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.
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Pressure-induced superconductivity in epitaxially-stabilized Pr$_3$Ni$_2$O$_7$ films
Epitaxially stabilized Pr3Ni2O7 films show pressure-induced superconductivity with onset Tc of 66 K at 22 GPa, while the Nd analog does not superconduct in the accessed pressure range.
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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.
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Interlayer hybridization enables superconductivity in bilayer nickelates
Superconductivity in bilayer nickelates emerges only when coherent interlayer d_z2-p_z-d_z2 hybridization develops, suppressing static spin-density-wave order and damping spin excitations.
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Tunable superconductivity and spin density wave in La3Ni2O7/LaAlO3 thin films
Varying the Ni-Ni interlayer distance switches La3Ni2O7/LaAlO3 films between C-type and G-type spin density waves, with s± superconductivity emerging in between.
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Theoretical study on ambient pressure superconductivity in La$_3$Ni$_2$O$_7$ thin films : structural analysis, model construction, and robustness of $s\pm$-wave pairing
s±-wave pairing in La3Ni2O7 thin films is robust across different crystal structures, and the halved transition temperature is reproduced only when the experimentally determined structure with small interlayer hopping is used.
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Optical control of the crystal structure in the bilayer nickelate superconductor La3Ni2O7 via nonlinear phononics
First-principles calculation shows selective excitation of an IR phonon mode in La3Ni2O7 produces a small nonlinear shift that moves the Ni-O-Ni bond angle closer to 180 degrees.
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Electronic theory for scanning tunneling microscopy spectra in bilayer nickelate thin films
Position-dependent STM spectra in La2PrNi2O7 are computed from a two-orbital bilayer model, showing orbital-selective coherence peaks and impurity scattering that enable band identification.
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Strain-Engineered Electronic Structure and Superconductivity in La$_3$Ni$_2$O$_7$ Thin Films
DFT-based tight-binding models and FRG calculations predict that reducing in-plane lattice constant or increasing out-of-plane constant in La3Ni2O7 films increases Fermi-level DOS and enhances Tc while preserving s± pairing.
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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.
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Squeezing dynamical singlets in bilayer nickelates
Dynamical singlets from 3z²-r² orbitals hybridized with x²-y² orbitals control the distinct pressure versus strain responses in bilayer nickelates.
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Superconductivity in bilayer La$_3$Ni$_2$O$_7$: A review focusing on the strong-coupling Hund's rule assisted pairing mechanism
Superconductivity in La3Ni2O7 arises from interlayer Cooper pairs of 3d_x2-y2 electrons driven by effective J_perp from Hund-assisted AFM exchange transfer, while localized 3d_z2 electrons form rung singlets that produce a pseudogap but no condensate.
- Density waves in low-pressure bilayer nickelates
- Orbital-Selective Diagonal-Gap Test of Pairing in La$_3$Ni$_2$O$_7$