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Orbital-selective correlation effects and superconducting pairing symmetry in a multiorbital t-J model for bilayer nickelates
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Orbital-selective correlation effects and superconducting pairing symmetry in a multiorbital t-J model for bilayer nickelates
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The recent discovery of superconductivity in La$_3$Ni$_2$O$_7$ raises key questions about its mechanism and the nature of pairing symmetry. This system is believed to be described by a bilayer two-orbital Hubbard model. The considerations of orbital-selective Mott correlations motivate a bilayer two-orbital $t$-$J$ model and, accordingly, we study the superconducting pairing in this model. We obtain an overall phase diagram of superconductivity, where the leading channel has either extended $s$-wave or $d_{x^2-y^2}$-wave symmetry. Our analysis highlights how the orbital-selective correlations affect the superconducting pairing via the interlayer exchange couplings and low-energy electronic structure. In particular, we find that the dominant orbital for the pairing may change between $z^2$ and $x^2-y^2$ when the position of the bonding $z^2$ band is varied by tuning either the $c$-axis lattice constant or electron concentration strength. We discuss the implications of these results for the superconductivity in both bulk La$_{3}$Ni$_{2}$O$_{7}$ and its thin film counterpart.
Forward citations
Cited by 6 Pith papers
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Magnetic Order in bilayer Ruddlesden-Popper Nickelates
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.
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Possible Enhancement of Superconductivity in Ambient-Pressure La$_3$Ni$_2$O$_7$ Thin Film
A δ pocket of dz2 character near Γ enhances s± pairing in a model of La3Ni2O7 films by nesting with the γ pocket, raising the Eliashberg eigenvalue λ.
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Pairing Mechanism in Bilayer Nickelate La$_3$Ni$_2$O$_7$ Superconductors
Two specific antiferromagnetic exchange channels in bilayer La3Ni2O7 produce a robust s± superconducting state via the gene principle and collaborative Fermi-surface rule.
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Compressive Strain Turns $s^{\pm}$ into $d$-Wave Pairing in One-unit-cell La$_3$Ni$_2$O$_7$ Thin Film Via Substrate-Induced Hole Doping
Hole doping drives the pairing in strained 1-unit-cell La3Ni2O7 films from weak/nonexistent to a d_x2-y2 (then d_xy) wave, through intra-layer spin fluctuations within the γ pocket.
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Impact of multiband effects on non-Fermi-liquid transport phenomena in bilayer nickelates
Multiband effects and orbital-selective damping in bilayer nickelates produce pronounced temperature dependence in the Hall coefficient via the quasi-quantum metric contribution to transport.
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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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