Mn5Ge3 contracted-cell control (a=7.273, c=5.36), no interstitial
.cifMn5Ge3 at the high-pressure contracted lattice (Zhang et al. 2026, Fig. S3: a=7.273 A, c=5.36 A) WITHOUT the Ge 2a interstitial - isolates the pure lattice-contraction effect on Mn-Mn exchange, matching the paper's Fig. 1f DFT protocol (a contracted at fixed c). ICSD prototype coordinates (file 97198f72-488c-42ea-95b2-15f845a5161a) rescaled. Control arm for receipt claim C6 in dataset 019fde0f-18b5-781b-b60b-12f01dac6b0a.