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Effective model and pairing tendency in bilayer Ni-based superconductor La$_3$Ni$_2$O$_7$

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arxiv 2306.07275 v2 pith:7C2J66H3 submitted 2023-06-12 cond-mat.supr-con cond-mat.str-el

Yuhao Gu , Congcong Le , Zhesen Yang , Xianxin Wu , Jiangping Hu This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords modelsuperconductivitybilayerelectronichigh-tpairingstructurediscovery
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abstract

Since the discovery of cuprate, the origin of high-T$_c$ superconductivity has been an outstanding puzzle. Recently, high-T$_c$ superconductivity was observed in a bilayer nickelate La$_3$Ni$_2$O$_7$ under pressure, whose structure hosts the apical oxygen between two layers, distinct from multi-layer cuprates. Motivated by this discovery, we investigate its electronic structure using first-principle calculations and superconducting instabilities from both weak-coupling and strong-coupling perspective. Based on the first-principle band structures, we construct a bilayer two-orbital model on a square lattice, consisting of $d_{x^2-y^2}$ and $d_{z^2}$ orbitals, which accurately captures the low-energy electronic properties. Within this model, we study pairing instability using both functional renormalization group approach and multi-orbital t-J model. An $s_{\pm}$-wave pairing with sign-reversal gaps on different Fermi surfaces is revealed, reminiscent of iron based superconductors. The Ni-$d_{z^2}$ orbital and its associated interlayer and intralayer exchange couplings are found to be crucial for the high-T$_c$ superconductivity. Our study provides valuable insights into unique nature of electronic structure and superconductivity in La$_3$Ni$_2$O$_7$ and contributes to the understanding of unconventional superconductors.

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Cited by 15 Pith papers

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

  1. Multiorbital character of the density wave in trilayer nickelate superconductors

    cond-mat.str-el 2025-08 unverdicted novelty 6.0 of 10

    Polarized Raman scattering on trilayer nickelate La4Ni3O10 identifies 114 meV as the density wave gap, with a multiorbital origin involving both Ni-3d orbitals.

  2. In-Plane Ni-O-Ni Bond Angles as Structural Fingerprints of Superconductivity in Layered Nickelates: Effects of Pressure, Strain, Layering, and Correlations

    cond-mat.supr-con 2025-06 conditional novelty 6.0 of 10

    The in-plane Ni-O-Ni bond angle in layered nickelates tracks the experimental superconducting Tc dome under pressure and strain, suggesting it as a structural fingerprint.

  3. Pressure and strain effects on the $\textit{ab initio}$ $GW$ electronic structure of La$_3$Ni$_2$O$_7$

    cond-mat.supr-con 2025-04 conditional novelty 6.0 of 10

    A one-shot GW calculation predicts that correlations remove the gamma hole pocket of La3Ni2O7 and that the La-5d x2-y2 band approaches the Fermi level under pressure and strain, matching ARPES without a Hubbard U.

  4. Superconductivity and normal-state transport in compressively strained La$_2$PrNi$_2$O$_7$ thin films

    cond-mat.supr-con 2025-01 conditional novelty 6.0 of 10

    Compressively strained La2PrNi2O7 thin films show ambient-pressure superconductivity with onset above 48 K, zero resistance above 30 K, and cuprate-like normal-state transport.

  5. Pressure-tunable structural instabilities in single-layer-trilayer La$_3$Ni$_2$O$_7$

    cond-mat.supr-con 2024-12 conditional novelty 6.0 of 10

    DFT phonon calculations show the P4/mmm phase of single-layer-trilayer La3Ni2O7 is unstable at all pressures up to 30 GPa, and the lowest-energy distortions combine two instabilities, contrary to experimental refinements.

  6. Origin of the Diagonal Double-Stripe Spin-Density-Wave and Potential Superconductivity in Bulk La$_3$Ni$_2$O$_{7}$ at Ambient Pressure

    cond-mat.supr-con 2024-12 conditional novelty 6.0 of 10

    An RPA analysis of an eight-band tight-binding model for ambient-pressure La3Ni2O7 reproduces the experimentally observed unidirectional diagonal double-stripe spin-density-wave and predicts enhanced pairing under hol...

  7. Numerical study of bi-layer two-orbital model for La$_{3}$Ni$_{2}$O$_{7}$ on a plaquette ladder

    cond-mat.str-el 2024-11 conditional novelty 6.0 of 10

    DMRG on a plaquette ladder model of La3Ni2O7 finds orbital-selective charge order, Neel-type spin correlations, and period-2 pairing-correlation sign oscillations suggestive of a pair density wave.

  8. Spin-density wave and superconductivity in La$_4$Ni$_3$O$_{10}$ under ambient pressure

    cond-mat.supr-con 2024-11 conditional novelty 6.0 of 10

    In La4Ni3O10 at ambient pressure, a stripe spin-density wave with wave vector near (0.7π,0) is driven by Hund's coupling, and hole doping around δ=-0.4 is predicted to induce superconductivity.

  9. Strongly Anisotropic Charge Dynamics in La3Ni2O7 with Coherent-to-Incoherent Crossover of Interlayer Charge Dynamics

    cond-mat.supr-con 2024-11 conditional novelty 6.0 of 10

    In La3Ni2O7, in-plane charge transport stays coherent from 10 to 300 K, while interlayer transport switches from coherent to incoherent as temperature rises toward 300 K.

  10. Examining density wave correlations in high pressure $\rm{La_3Ni_2O_7}$ through variational Monte Carlo

    cond-mat.supr-con 2025-09 reject novelty 5.0 of 10

    VMC on the high-pressure La3Ni2O7 bilayer model shows (pi,pi) in-plane spin/charge correlations, but the claimed inter-layer CDW transition to (pi,pi,0) is contradicted by the paper's own sign convention.

  11. Orbital correlations in bilayer nickelates: roles of doping and interlayer coupling

    cond-mat.str-el 2025-02 conditional novelty 5.0 of 10

    In a two-orbital RPA model of La3Ni2O7, transverse orbital fluctuations peak at (π/2, π/2) and sit closer to divergence than longitudinal ones, pointing to a possible orbital-fluctuation mechanism.

  12. Spin density wave and superconductivity in the bilayer $t$-$J$ model of $\rm{La}_{3}Ni_{2}O_{7}$ under renormalized mean-field theory

    cond-mat.supr-con 2024-12 conditional novelty 5.0 of 10

    A renormalized mean-field study of a bilayer t-J model predicts antiferromagnetic d-wave and double-spin-stripe s-wave coexistence states in La3Ni2O7, with the transition tuned by inter-layer coupling.

  13. Theoretical investigation of the superconducting pairing symmetry in a bilayer two-orbital model of pressurized La$_3$Ni$_2$O$_7$

    cond-mat.supr-con 2024-12 conditional novelty 5.0 of 10

    In a bilayer two-orbital model of pressurized La3Ni2O7, the γ band alone yields ferromagnetic fluctuations and odd-frequency triplet pairing, while all four bands together give s±-wave pairing.

  14. The effect of Carrier Doping and Thickness on the Electronic Structures of La$3$Ni$2$O$7$ Thin Films

    cond-mat.supr-con 2025-02 conditional novelty 4.0 of 10

    A DFT+U study finds that a two-unit-cell La3Ni2O7 film doped with roughly 0.3 holes per formula unit reproduces the ARPES-observed gamma Fermi pockets, linking hole doping and film thickness to ambient-pressure superc...

  15. Doping a spin-one Mott insulator: possible application to bilayer nickelate

    cond-mat.str-el 2025-09 conditional novelty 2.0 of 10

    A review of the authors' prior theoretical work proposing that bilayer spin-one Mott insulators with strong interlayer coupling can host kinetic-energy-driven high-Tc superconductivity and a second Fermi liquid normal state.

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