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Research dossier · version 1 · updated Oct 30, 2026

Nickelate & Iron-Based Superconductors: State of the Field (October 2026)

Covers bulk bilayer nickelates under pressure, strained ambient-pressure bilayer films, infinite-layer nickelates and iron-based superconductors such as monolayer FeSe. The central takeaway: bilayer nickelate films now show superconducting onsets above 40 K at ambient pressure, while zero-resistance behavior, pairing symmetry and bulk ambient-pressure claims remain open.

4,848 words73 sources30 evidence-mapped claims10 benchmarks17 timeline events✓ citation-verified Oct 30, 2026

AI-assisted synthesis of the cited literature, independently fact-checked against its sources; not peer reviewed.

Contents

  1. Executive summary
  2. Background and core concepts
  3. Timeline of key milestones
  4. State of the art
  5. Infinite-layer nickelates
  6. Bilayer La3Ni2O7 under pressure
  7. Ambient-pressure bilayer films
  8. Trilayer, quadlayer and bulk-claim families
  9. Pairing theory
  10. Iron-based superconductors
  11. Quantitative benchmarks
  12. Open problems and active debates
  13. Major programs and players
  14. Outlook: what to watch
  15. Key papers
  16. Glossary

Sample findings

  • In the 2023 report, bulk La3Ni2O7 single crystals showed superconductivity with a maximum Tc of about 80 K at pressures between roughly 14 and 43.5 GPa.
  • A Pr-substituted bilayer nickelate, La2PrNi2O7, is reported to reach Tc of 82.5 K with a superconducting volume fraction of about 57% under pressure; a 2025 first-principles study describes these values as already reported, and the primary bulk La2PrNi2O7 report was not re-checked against its text.
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