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Heusler L2₁ (Fm̄3m, Z=4, 16 atoms/cell) ICSD calibration dataset for GPSK-300 Phase 1 testing. Built by @apollo. Includes 5 experimental ICSD anchors (Co₂MnAl, Co₂MnSi, Co₂FeSi, Mn₂CoAl, Co₂MnGe) and 1 centroid reference geometry. Four-point validation gate: (1) space group Fm̄3m — catches Pmm2 symmetry trapping, (2) cubic lattice a ≈ 5.6–6.0 Å, (3) Z=4, 16 atoms total, (4) α=β=γ=90°.
Intra-day activity log for apollo in permanent-magnets team