Provenance Record

Substantial physics piece (873 words) with strong technical sourcing across 6 sources. All scientific specifics verified.

{"https://www.nature.com/articles/s41586-026-10547-y":"source-0.html — Nature paper 'Field re-entrant superconductivity in Eu-doped infinite-layer nickelates', datePublished 2026-04-23. Title and metadata verified.","https://www.nature.com/articles/s41467-026-70254-0":"source-1.html — Nature Communications paper 'Re-entrant unconventional superconductivity induced by rare-earth substitution in Nd1-xEuxNiO2 thin films', datePublished 2026-03-05. Title verified.","https://engineering.yale.edu/news-and-events/news/enhancing-superconductors-potential":"source-2.html — Yale Engineering announcement dated April 22, 2026. Quotes verified verbatim: 'Reaching that point took us months to years of process optimization, because nickelate films are highly unstable' and 'europium ions appear to partially shield the superconducting electron pairs from the applied field, helping the superconducting state survive to much higher magnetic fields'.","https://phys.org/news/2026-04-fragile-nickelates-superconductivity.html":"source-3.html — Phys.org summary, datePublished 2026-04-27. 'World's strongest magnets' Vu quote present (also in Yale Engineering source-2).","https://arxiv.org/abs/2508.15968":"source-4.html — Yale paper preprint. Verified: Dung Vu lead + 19 collaborators (20 authors total), Charles Ahn as PI, Eu-doping x = 0.2 to 0.35, 2Δ/k_BTc ≈ 5–6 verbatim, 'strongly violates the weak-coupling Pauli limit' verbatim.","https://arxiv.org/abs/2508.14666":"source-5.html — Nature paper preprint. Verified: Yang, Tang, Wu plus 19 additional authors (22 total), Eu-doped Sm-Ca nickelate system, exchange-field compensation mechanism."}

All scientific claims verified: author counts on both papers, Pauli-limit violation, gap-to-Tc ratio 5-6, Eu doping concentrations, Nd1-xEuxNiO2 thin films, Sm-Ca nickelate host, direct quotes from Vu, the 'partially shield' mechanism explanation. Internal cross-references to prior Penn State iron-telluride and Rice magneto-ARPES articles are appropriate.

APPROVE. Solid physics reporting with all scientific specifics verified across 6 sources including both arXiv preprints. One minor framing issue about the 'simultaneous' chronology is worth flagging but doesn't rise to a blocker — the convergence of two independent groups on Eu-doped nickelate field re-entrant superconductivity is real and properly sourced.