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Electronic structure of compressively strained thin film La₂PrNi₂O₇
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Electronic structure of compressively strained thin film La₂PrNi₂O₇
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The discovery of superconductivity in the bulk nickelates under high pressure is a major advance in physics. The recent observation of superconductivity at ambient pressure in compressively strained bilayer nickelate thin films has now enabled direct characterization of the superconducting phase through angle resolved photoemission spectroscopy (ARPES). Here we present an in-situ ARPES study of compressively strained La$_2$PrNi$_2$O$_7$ films grown by oxide molecular beam epitaxy, and the ozone treated counterparts with an onset T$_c$ of 40 K, supplemented with results from pulsed laser deposition films with similar T$_c$. We resolve a systematic strain-driven electronic band shift with respect to that of bulk crystals, in qualitative agreement with density functional theory (DFT) calculations. However, the strongly renormalized flat 3$d_{z2}$ band shifts a factor of 5-10 smaller than anticipated by DFT. Furthermore, it stays ~70 meV below the Fermi level, contradicting the expectation that superconductivity results from the high density of states of this band at the Fermi level. We also observed a non-trivial k$_z$ dispersion of the cuprate-like 3$d_{x2-y2}$ band. Combined with results from both X-ray diffraction and DFT, we suggest that the strained films are under ~5 GPa effective pressure, considerably larger than the na\"ive expectation from the DFT relaxed structure. Finally, the ~70 meV energy position is intriguingly close to the collective mode coupling more prominently seen in thin films, in the energy range of both oxygen related phonons and the maximum of the spin excitation spectrum.
Forward citations
Cited by 33 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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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 th...
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Atomically resolved intrinsic superconducting gap in (La,Pr)3Ni2O7 films
STM spectroscopy on bilayer nickelate ultrathin films reveals reproducible U-shaped spectra with nodeless gaps of ~14 and ~20 meV and flat zero-conductance regions.
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Orbital-Selective $d$-wave Superconductivity in the Two-Band $t$-$J$ Model: Possible Applications to La$_3$Ni$_2$O$_7$
Orbital-selective d-wave superconductivity arises exclusively from the itinerant orbital in the two-band t-J model, suppressed by local inter-orbital bound states from the quasi-localized orbital.
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Doping evolution of spin excitations in La$_{3-x}$Sr$_{x}$Ni$_2$O$_7$/SrLaAlO$_4$ superconducting thin films
Spin excitations persist with nearly unchanged exchange energy through the superconducting dome of Sr-doped La3Ni2O7 films, then collapse into a damped continuum when superconductivity is lost at x=0.38.
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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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Nearly perfect Fermi surface nesting in hole-doped La$_3$Ni$_2$O$_7$ enables bulk superconductivity without pressure or strain
Hole doping at x ≈ 0.4 in La3-xSrxNi2O7 produces nearly perfect Fermi-surface nesting at Q = (π, π), raising the superconducting eigenvalue to experimentally accessible levels at ambient pressure.
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Correlation-Driven Orbital-Selective Fermiology and Superconductivity in the Bilayer Nickelate La$_3$Ni$_2$O$_7$
Correlations in the nickelate drive the gamma band below the Fermi level and shift the dominant superconducting pairing to d_x2-y2 interlayer spin-singlet mediated by antiferromagnetism and Hund's coupling.
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$3d_{z^2}$ orbital delocalization and magnetic collapse in superconducting (La,Pr)$_3$Ni$_2$O$_{7-\delta}$ films
Compressive strain and oxygenation in (La,Pr)₃Ni₂O₇₋δ films delocalize Ni 3d_z² and O 2p_z orbitals, suppress long-range spin-density-wave order, and preserve short-range magnons as prerequisites for superconductivity.
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Three-Dimensional Electronic Structures in Superconducting Ruddlesden-Popper Bilayer Nickelate Films
ARPES on (La,Pr,Sm)3Ni2O7 films reveals quasi-2D dx2-y2 bands, finite kz dispersion on dz2 bands, and a superconducting gap of ~18 meV with 2Δ/kBTc ~8 on the dz2-derived band.
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Multimodal Terahertz Spectroscopy of the Pairing Symmetry and Normal-State Pseudogap in (La,Pr)$_3$Ni$_2$O$_7$ Films
Terahertz spectroscopy on (La,Pr)3Ni2O7 films indicates disordered s±-wave pairing in the superconducting state and a distinct normal-state pseudogap above Tc onset.
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Triplon-mediated pairing and the superconducting gap structure in bilayer nickelates
Interlayer singlet-triplet excitations (triplons) mediate an interband s± superconducting pairing that explains the larger α-band gap and its anisotropy in bilayer nickelates.
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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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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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A unified theory of thin film and bulk bilayer nickelates
A two-component scenario unifies key observations in bilayer nickelate superconductivity, predicting doping-dependent superconducting domes and normal-state behaviors that differ by interlayer coupling strength.
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Electron Doping of $\mathrm{La_3Ni_2O_7}$ Thin Films: Candidate Metal Dopants and Their Potential Impact on Superconductivity
DFT study identifies Zr, Hf, Th as efficient electron dopants for La3Ni2O7 that boost t_perp between d_z2 orbitals and may elevate Tc via enhanced J_perp.
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The evolution of pairing correlation with $3d_{z^{2}}$ electron filling in a bilayer two-orbital model for La$_3$Ni$_2$O$_7$
DMRG simulations on a 1D bilayer two-orbital model for La3Ni2O7 show superconducting correlations suppressed near half-filling of the 3d_z2 orbital, indicating its itinerancy favors pairing.
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Co-operating multiorbital and nonlocal correlations in bilayer nickelate
In a three-orbital model of bilayer nickelate, nonlocal correlations produce spin-polaron shadow bands below the Fermi level when the gamma quasiparticle band crosses it, depending on interorbital interaction strength.
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Granular Superconductivity in La$_{2}$PrNi$_{2}$O$_{7-\delta}$ Thin Films
The two-step resistive transition in La2PrNi2O7-δ thin films arises from granular superconductivity involving two distinct grain phases coupled by a Josephson junction network.
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Filling and Interlayer Superexchange Control Superconductivity in La$_3$Ni$_2$O$_7$
The superconducting T_c of La3Ni2O7 is controlled by the d_x2-y2 orbital filling and the interlayer magnetic exchange J_perp, so clean electron doping should raise T_c.
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Filling and Interlayer Superexchange Control Superconductivity in La$_3$Ni$_2$O$_7$
A d_x2-y2 orbital bilayer t-J model with first-principles parameters unifies experimental Tc controls in La3Ni2O7 via particle-hole asymmetry and J_perp dependence, proposing electron doping to enhance Tc.
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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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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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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 remains robust in La3Ni2O7 thin-film models under FLEX, but reduced Tc is reproduced only when using the experimental structure's small interlayer hopping.
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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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Theoretical study of superconductivity in freestanding infinite-layer nickelate membranes under pressure: mitigation of excess correlation enhances $T_c$
Seven-orbital FLEX calculation on pressurized infinite-layer nickelate membrane attributes monotonic Tc rise to mitigation of excess electron correlations from low Ni valence.
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Jahn-Teller distortion on strained La$_3$Ni$_2$O$_7$ thin films
Compressive strain enhances Jahn-Teller splitting Δ_JT in La3Ni2O7 films as the key microscopic tuning parameter for superconductivity, matching ARPES and Hall data on specific substrates.
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Filling and Interlayer Superexchange Control Superconductivity in La$_3$Ni$_2$O$_7$
The d_x2-y2 bilayer t-J model unifies Tc control in La3Ni2O7 via particle-hole asymmetry under doping and dependence on the perpendicular exchange J_perp.
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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 prod...
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Experimental Progress in Ambient-Pressure Superconducting Bilayer Nickelate Films
Epitaxial strain enables ambient-pressure superconductivity in bilayer nickelate films, facilitating detailed studies of their properties and phase diagrams.
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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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Recent progress in nickelate superconductors
A comprehensive review of nickelate superconductors that surveys the 112, 327, and 43(10) families and frames the key open questions about their pairing mechanisms.
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