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

Research dossier · v1 · updated 2026-10-30 · 4,848 words · 73 sources · 30 claims · verification: verified

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.

## Contents

- Executive summary
- Background and core concepts
- Timeline of key milestones
- State of the art
  - Infinite-layer nickelates
  - Bilayer La3Ni2O7 under pressure
  - Ambient-pressure bilayer films
  - Trilayer, quadlayer and bulk-claim families
  - Pairing theory
  - Iron-based superconductors
  - Quantitative benchmarks
- Open problems and active debates
- Major programs and players
- Outlook: what to watch
- Key papers
- 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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