articleNational Science ReviewMay 21, 2025GOLD OA

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

LPLiming PengGZGuangdi ZhouWLWei LvYLYueying LiCYChangming Yue

Southern University of Science and Technology · Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area · +5 more institutions

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Abstract

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 La2.85Pr0.15Ni2O7 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…

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43
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14.53
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100%
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22

Topics & keywords

Topics
Keywords
  • Superconductivity
  • Photoemission spectroscopy
  • Heterojunction
  • Spectroscopy
  • Materials science
  • Angle-resolved photoemission spectroscopy
  • Condensed matter physics
  • X-ray photoelectron spectroscopy
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