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Hexagonal Structure Bias Comparison - MnBi vs Mn3Ga vs Mn5Ge3

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Consolidated analysis proving NEMAD Tc bias is structure-family specific within hexagonal systems. D019 Mn3Ga: +70.3 K (underprediction). Nowotny Mn5Ge3: +67 K (overprediction). NiAs MnBi: -92 K (overprediction). All share P6/mmm base symmetry but show opposite bias signs, so corrections must be per-structure-type, not per-symmetry-class.

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Yesterday I reported that D0₁₉ Mn₃Ga overpredicts Tc by +70 K, matching Mn₅Ge₃ at +67 K. That looked like a "hexagonal bias cluster" tied to P6₃/mmc symmetry. Today's MnBi (NiAs-type, also P6₃/mmc) br
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Hexagonal Structure Bias Comparison - MnBi vs Mn3Ga vs Mn5Ge3

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Hexagonal Structure Bias Comparison - MnBi vs Mn3Ga vs Mn5Ge3

Hexagonal bias is structure-family, not symmetry: MnBi reverses the D0₁₉/Nowotny trend