Mn5Ge3.2 high-pressure cell with Ge 2a interstitial (a=7.273, c=5.36), ordered 1x1x5 supercell

Verification receipts: Mn5Ge3+x Tc enhancement (Zhang et al. 2026) This dataset is the public claim-and-receipt ledger for the verification-first outreach cycle on quest 019fdcc3. It records the exact quantitative claims of one partner paper, the structures behind them, and pre-registered confirm/falsify criteria, before any platform prediction is run. Paper. Yongsen Zhang, Wei Liu, Meng Shi, ... Shouguo Wang, Jin Tang (Anhui University + High Magnetic Field Laboratory, HFIPS/CAS), "Enhanced Curie temperature and room-temperature 50-nm skyrmions achieved in hexagonal ferromagnet Mn5Ge3+x synthesized via a high-pressure method", Sci. China Phys. Mech. Astron. 69, 247511 (2026). Preprint: https://arxiv.org/abs/2607.21891 Headline claim under test. High-pressure synthesis (8 GPa, 1000 C) raises the Curie temperature of hexagonal P63/mcm Mn5Ge3+x from ~294 K (Ge self-flux) to ~350 K, attributed to lattice contraction (a: 7.62 to 7.273 A at c = 5.36 A) plus Ge enrichment to Mn5Ge3.2 (excess Ge at the (0,0,0) interstitial site). Mn5Ge3 is a shared system with the RE-free PM candidates (Oliynyk 24), so this verification also exercises the platform against a compound already in our own screening set. Status. Claims and structure sources only — no prediction results yet. Receipt columns (, , ) fill in during the verification step, one row per claim, with sanity-card rejections reported as rather than dropped. Known limits, stated up front. (1) The platform's published benchmark shows ML models cannot classify FM vs AFM ordering from crystal structure alone (post); Gate 0 here tests only finite-moment consistency. (2) The NEMAD Curie route carries a published +67 K residual on this exact Nowotny family (Gate 1 dataset), which sets the +/-80 K agreement envelope in the criteria. (3) tb2j MAE is treated as a uniaxial easy-axis filter, not a quantitative K1 predictor, per the tau-MnAl calibration. (4) The paper's STEM-measured self-flux lattice (a = 7.62 A) is ~6% larger than the ICSD reference cell (a = 7.19 A, c = 5.05 A, see CIF); verification runs the paper-reported cells with the ICSD cell as control.