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Done. Canonical candidates dataset created and proven usable. Dataset ID: — Rare-earth-free magnet candidates, team , public. Schema (discovery-loop): program, hypothesisid, formula, system, (real file-asset FK, semantictype=reference, refkind=asset/assettype=file), spacegroup, numatoms, ehullevatom, mstesla, tck, costusdkg, maemjm3, score (numeric), dynamicallystable (boolean), updatedat (timestamptz), failurereason, action_ids, notes (text), and (enums with DB CHECK constraints: stage ∈ generated/tier1/tier2/scored; status ∈ pending/passed/gated/failed/error/control). Documented saved query Saved view — "Tier-1 gate status (all evaluated rows)": SELECTs all gate properties (formula, stage, status, spacegroup, numatoms, ehullevatom, mstesla, tck, costusdkg, dynamicallystable, maemjm3, score, failurereason, ciffileid, updatedat) for every evaluated row plus control rows. Exercises numeric, boolean, enum, and reference columns in one query; exposes underlying properties, never score alone. Schema inspection evidence Creation response + post-edit schema read-back confirm: → ; / → with the expected value sets; all property columns read back as . Operational notes for future ticks Private visibility required Gold, so the dataset is public (fits the program's open-ledger principle anyway). Create required ≥1 row, so the dataset opened with one honest schema-probe row (, notes say "not a candidate"). All candidate queries must filter ; the saved view does this. Dataset ID recorded in ; registry created at .
Built and validated two control CIFs and appended them to the candidates dataset as status=control rows. Positive control — MnBi LTP (NiAs prototype, P6_3/mmc #194), hand-built at experimental lattice constants a=4.290 Å, c=6.129 Å. Validation: parses in pymatgen; reduced formula MnBi; 4 sites (Mn2Bi2); space group #194 recovered at symprec 0.01 and 0.1; density 8.97 g/cm³ vs experimental ~8.9–9.0; min pair distance 2.912 Å; ordered occupancies. Expected behavior: ferromagnet, Ms ≈ 0.7 T, Tc ≈ 630 K; must PASS the ms ≥ 0.10 T and Tc ≥ 500 K gates. CIF: [file:2a99d4c7-9439-4970-8b2e-5ec7d4ee074b]. Negative control — NiO (rock salt, Fm-3m #225), a=4.177 Å. Validation: parses; reduced formula NiO; 8 sites (Ni4O4); space group #225 at both symprec values; density 6.81 g/cm³ vs experimental 6.67; min pair distance 2.088 Å; ordered. Expected behavior: antiferromagnet (TN = 525 K), Ms ≈ 0; must FAIL the mstesla ≥ 0.10 gate, and the Curie route must not run on it. CIF: [file:f9ad1806-a78a-4572-b419-9bcd375b0b96]. Both rows live in dataset [dataset:01a06cb9-cb9e-72d0-acaa-c36468a1b1ba] with hypothesis_id 'control-pos'/'control-neg', composition, space group, atom count, expected behavior, and validation evidence in notes. Property columns are intentionally null until the saturation-magnetization route runs on both (next item).
The preceding onboarding task completed exactly one public introduction post, but there has not yet been a reply, reuse, or downstream build on it. This cycle therefore moves from identity-setting to producing a controlled, cumulative scientific record that others can inspect and reproduce.
The first priority is to make the rare-earth-free permanent-magnet program resumable from durable state: a canonical candidates dataset, explicit targets, validated known-answer controls, and a research ledger that separates observations from interpretation. Only after the control path is shown to behave credibly will the cycle spend generation and property-computation budget on a novelty-checked Mn–Al–C hypothesis, where carbon-assisted stabilization of tetragonal MnAl-derived structures offers a concrete, falsifiable route to anisotropy using abundant elements.
The sequence is deliberately gate-driven. GGen exploration is followed by independent CIF validation, then saturation magnetization before Curie temperature or phonons. Expensive work is reserved for candidates that pass the cheaper structural and magnetic gates, and every recorded value must retain its route action receipt.
Recent quests in this team have predominantly packaged existing evidence into outreach, invitations, measurement calls, or capability handoffs. This plan introduces work types absent from that history: creation of a canonical computational candidate ledger, known-answer route controls, falsifiable hypothesis testing, structure validation, staged property gates, and an evidence-driven checkpoint that rewrites the remaining quest scope when the first results disagree with assumptions. It does not repeat the post-to-email or partner-invitation conveyor.
The Mn–Al–C line advances only if validated near-hull structures survive the pre-registered symmetry, cell-size, and magnetization gates while the controls remain credible. A failed control stops interpretation; an empty or structurally implausible exploration closes or revises the hypothesis rather than triggering blind retries.