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Related Experiment Video

Updated: Nov 6, 2025

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Superconducting Sr2RuO4 Thin Films without Out-of-Phase Boundaries by Higher-Order Ruddlesden-Popper Intergrowth.

Jinkwon Kim1,2, Junsik Mun1,3, Carla M Palomares García4

  • 1Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea.

Nano Letters
|May 12, 2021
PubMed
Summary

Researchers developed a method to create high-quality Ruddlesden-Popper (RP) phase films by controlling the growth of strontium ruthenate. This approach suppresses defects, leading to enhanced superconductivity in Sr2RuO4 films.

Keywords:
Ruddlesden−Popper phaseSr2RuO4 thin filmsout-of-phase boundarypulsed laser depositionunconventional superconductivity

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Thin Film Growth

Background:

  • Ruddlesden-Popper (RP) phases (An-1BnO3n+1) are crucial for diverse device applications.
  • High-quality RP-phase films are difficult to synthesize due to out-of-phase boundaries (OPBs).
  • OPBs arise from lattice mismatch between the RP film and the substrate.

Purpose of the Study:

  • To develop an experimental approach for suppressing OPBs in RP-phase films.
  • To achieve nearly defect-free Sr2RuO4 (n=1) films.
  • To enhance the superconducting properties of Sr2RuO4 thin films.

Main Methods:

  • Utilized strontium ruthenate RP-phase Sr2RuO4 (n=1) as a model system.
  • Tuned growth parameters to control film composition and structure.
  • Introduced a higher-order RP-phase (Sr3Ru2O7, n=2) at the film-substrate interface.

Main Results:

  • Successfully suppressed the formation of OPBs by introducing the Sr3Ru2O7 (n=2) intergrowth phase.
  • Obtained nearly defect-free Sr2RuO4 (n=1) layers.
  • Achieved superconductivity in Sr2RuO4 films up to 1.15 K, a record for pulsed laser deposition.

Conclusions:

  • The controlled intergrowth of higher-order RP phases can effectively eliminate OPBs.
  • This method enables the synthesis of pristine RP-phase heterostructures.
  • The findings open avenues for exploring unique physical properties of defect-free RP materials.