{"slug":"nickelates-iron-based","topic":"nickelates-iron-based","title":"Nickelate & Iron-Based Superconductors: State of the Field (October 2026)","summary":"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.","version":1,"published_at":"2026-10-30","updated_at":"2026-10-30","stats":{"words":4848,"citations":73,"claims":30,"timeline":17,"benchmarks":10,"open_problems":8,"key_papers":14,"glossary":16},"verification":{"status":"verified","method":"automated figure and citation-relevance triage against cited abstracts, plus targeted AI review with web checks of flagged statements; automated citation resolution","claims_checked":12,"issues_fixed":9,"verified_at":"2026-10-30"},"ai_assisted":true,"price":{"usd":"0.20","protocol":"x402","network":"eip155:84532","asset":"USDC"},"url":"https://space-kitty.com/dossiers/nickelates-iron-based","preview_url":"https://space-kitty.com/api/v1/dossiers/nickelates-iron-based/preview","purchase_url":"https://space-kitty.com/api/v1/dossiers/nickelates-iron-based","toc":[{"level":2,"text":"Executive summary","anchor":"executive-summary"},{"level":2,"text":"Background and core concepts","anchor":"background-and-core-concepts"},{"level":2,"text":"Timeline of key milestones","anchor":"timeline-of-key-milestones"},{"level":2,"text":"State of the art","anchor":"state-of-the-art"},{"level":3,"text":"Infinite-layer nickelates","anchor":"infinite-layer-nickelates"},{"level":3,"text":"Bilayer La3Ni2O7 under pressure","anchor":"bilayer-la3ni2o7-under-pressure"},{"level":3,"text":"Ambient-pressure bilayer films","anchor":"ambient-pressure-bilayer-films"},{"level":3,"text":"Trilayer, quadlayer and bulk-claim families","anchor":"trilayer-quadlayer-and-bulk-claim-families"},{"level":3,"text":"Pairing theory","anchor":"pairing-theory"},{"level":3,"text":"Iron-based superconductors","anchor":"iron-based-superconductors"},{"level":3,"text":"Quantitative benchmarks","anchor":"quantitative-benchmarks"},{"level":2,"text":"Open problems and active debates","anchor":"open-problems-and-active-debates"},{"level":2,"text":"Major programs and players","anchor":"major-programs-and-players"},{"level":2,"text":"Outlook: what to watch","anchor":"outlook-what-to-watch"},{"level":2,"text":"Key papers","anchor":"key-papers"},{"level":2,"text":"Glossary","anchor":"glossary"}],"sample_claims":["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."],"includes":["markdown","claims","timeline","benchmarks","open_problems","key_papers","glossary","bibliography"],"citation_count":73,"how_to_buy":"GET https://space-kitty.com/api/v1/dossiers/nickelates-iron-based with an x402 client ($0.20, USDC on Base Sepolia (testnet))."}