Mixed Nd 4+/3+ and Cluster Magnetism in Hexagonal Perovskite 12R-Ba 4 NdMn 3 O 12−γ - Liam A. V. Nagle-Cocco; Madeline G. Port; James Eujin Park; Dennis Nordlund; Oliver Mueller; Stephan Lany; Anna A. Berseneva; Alicia M. Manjón-Sanz; Danielle R. Yahne; Mathias A. Kiefer; Yuntian Li; Benito Ariceaga Gonzalez; et al. (Journal of the American Chemical Society, 2026)