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Angle-resolved photoemission spectroscopy of superconducting (La,Pr)3Ni2O7/SrLaAlO4 heterostructures
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Ruddlesden-Popper bilayer nickelate thin film superconductors discovered under ambient pressure enable vast possibilities for investigating electronic structures of the superconducting state. Here, we report angle-resolved photoemission spectroscopy (ARPES) measurements of 1, 2, and 3 unit-cell epitaxial La2.85Pr0.15Ni2O7 films grown on SrLaAlO4 substates, through pure-oxygen in situ sample transportation. Evidence obtained using photons with distinct probing depths shows that conduction is localized primarily at the first unit cell near the interface. Scanning transmission electron microscopy (STEM), together with energy-dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), indicates that interfacial Sr diffusion and pronounced p-d hybridization gradient may collectively account for the interfacial confinement of conduction. Fermi surface maps reveal hole doping compared to non-superconducting ambient-pressure bulk crystals. Measurements of dispersive band structures suggest the contributions from both Ni dx2-y2 and dz2 orbitals at the Fermi level. Density functional theory (DFT) + U calculations capture qualitative features of the ARPES results, consistent with a hole-doped scenario. These findings constrain theoretical models of the superconducting mechanism and suggest potential for enhancing superconductivity in nickelates under ambient pressure.
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Cited by 4 Pith papers
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Superconducting gap structure and bosonic mode in La2PrNi2O7 thin films at ambient pressure
Tunneling spectra on La2PrNi2O7 thin films reveal a dominant anisotropic s-wave gap near 19 meV, a smaller gap of 6-8 meV, and a bosonic mode at about 30 meV, pointing to s± pairing.
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Pairing symmetry and superconductivity in La$_3$Ni$_2$O$_7$ thin films
RMFT on the bilayer two-orbital t-J model predicts s±-wave pairing in La3Ni2O7 thin films, with a nodeless beta pocket and Tc near 60 K, plus an inter-orbital d-wave channel that reinforces the dominant pairing.
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Orbital-selective correlation effects and superconducting pairing symmetry in a multiorbital $t$-$J$ model for bilayer nickelates
In a bilayer two-orbital t-J model for La3Ni2O7, the leading pairing is either extended s-wave or d_{x^2-y^2}-wave, and moving the z2 bonding band through the Fermi level switches the dominant pairing orbital from z2 ...
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The effect of Carrier Doping and Thickness on the Electronic Structures of La$3$Ni$2$O$7$ Thin Films
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...
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