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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Complex interactions at epitaxial oxide interfaces drive unique physical phenomena.
  • High-temperature superconductivity in lanthanum cuprate-based bilayers emerges from interface effects.
  • Local structural parameters critically influence emergent properties in oxide systems.

Purpose of the Study:

  • To investigate the influence of dopant ion size on local crystal structure and chemistry.
  • To understand how dopant size affects interface functionalities in oxide bilayers.
  • To correlate dopant characteristics with superconductivity in metallic-insulating oxide systems.

Main Methods:

  • Oxide molecular beam epitaxy for fabricating lanthanum cuprate-based bilayers.
  • Spherical-aberration-corrected scanning transmission electron microscopy for atomic-scale analysis.
  • Complementary techniques to assess structural, chemical, and superconducting properties.

Main Results:

  • A linear dependence of the out-of-plane lattice parameter on dopant ion size was observed.
  • Dopants exhibited characteristic diffusion lengths at the interface, indicating segregation behavior.
  • Superconductivity properties were found to be highly sensitive to the specific dopant used.

Conclusions:

  • Dopant size profoundly impacts the local crystal structure and interface chemistry of oxide bilayers.
  • Interface engineering through dopant selection is crucial for tailoring superconductivity.
  • The findings provide insights into the design of advanced superconducting oxide materials.