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Pairing symmetry and superconductivity in La₃Ni₂O₇ thin films
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Pairing symmetry and superconductivity in La₃Ni₂O₇ thin films
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The recent discovery of superconductivity with a transition temperature $T_c$ over 40 K in La$_3$Ni$_2$O$_7$ and (La,Pr)$_{3}$Ni$_2$O$_7$ thin films at ambient pressure marks an important step in the field of nickelate superconductors. Here, we perform a renormalized mean-field theory study of the superconductivity in $\mathrm{La_3Ni_2O_7}$ thin films, using a bilayer two-orbital $t-J$ model. Our result reveals an $s_\pm$-wave pairing symmetry driven by the strong interlayer superexchange coupling of $d_{z^2}$ orbital, resembling the pressurized bulk case. Also, we roughly reproduce the experimentally observed nodeless shape of the superconducting gap at the $\beta$ pocket and the superconducting $T_c$. In addition, by analysing the orbital-resolved pairing configurations and their projections onto Fermi surface, we find that the nodeless feature of $\beta$ pocket is related to the interlayer pairing within both $d_{z^2}$ and $d_{x^2-y^2}$ orbitals. Moreover, we identify a formation of the inplane inter-orbital $d$-wave pairing between $d_{z^2}$ and $d_{x^2-y^2}$ orbitals, which can even enhance the dominated interlayer $s_\pm$-wave. Our study particularly highlights the diverse relations of different pairing channels in $\mathrm{La_3Ni_2O_7}$ that holds a complex Fermi surface.
Forward citations
Cited by 9 Pith papers
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What Does the Single-Particle Spectrum Imply on the Pairing Nature and Pairing Mechanism in La$_3$Ni$_2$O$_7$?
Symmetry analysis shows orbital hybridization vanishes along the BZ diagonal, allowing the gap on alpha/beta pockets to test d_x2-y2 vs d_z2 dominance; experiments and RPA favor Hund's rule mechanism with full gap.
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Superexchanges and Charge Transfer in the La$_3$Ni$_2$O$_7$ Thin Films
In La3Ni2O7 thin films, the interlayer d3z2-r2 antiferromagnetic coupling is about 27% weaker than in bulk, in-plane coupling is nearly unchanged, and hole/electron doping is particle-hole asymmetric.
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Symmetry-Based Microscopic Theory of the Unconventional Pairing Mechanism in La$_5$Ni$_3$O$_{11}$
La5Ni3O11 superconductivity is predicted to be a two-gap s± state in the bilayer subsystem, with the T_c reduction tied to a reduced interlayer-to-intralayer hopping ratio.
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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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Tunable Superconductivity in 1313-La$_3$Ni$_2$O$_7$: Suppressed under Compression and Possible $s^{\pm}$ Pairing under Tension
RPA calculations predict strain-tunable superconductivity in 1313-La3Ni2O7 films, with s± pairing emerging under tensile strain when the γ pocket is optimally sized.
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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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Pairing Symmetry Crossover from $d$-wave to $s_{\pm}$-wave in a Bilayer Nickelate Driven by Hund's Coupling and Crystal Field Splitting
Constrained-path QMC simulations of a bilayer Hubbard model map a crossover from d-wave to s±-wave pairing driven by Hund's coupling and crystal field splitting in La3Ni2O7.
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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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Superconductivity in Ruddlesden-Popper nickelates: a review of recent progress, focusing on thin films
The review covers experimental and theoretical progress on superconductivity in Ruddlesden-Popper nickelates, emphasizing ambient-pressure thin-film results in La3Ni2O7.
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