Angle-resolved photoemission spectroscopy of superconducting (La,Pr)₃Ni₂O₇/SrLaAlO₄ heterostructures.

ABSTRACT: Ruddlesden-Popper bilayer nickelate thin film superconductors discovered under ambient pressure enable great 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 La_2.85Pr_0.15Ni₂O₇ films grown on SrLaAlO₄ substrates, 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 interfaci

SUBMITTER: Li P 

PROVIDER: S-EPMC12485603 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature