Hund’s flat band in a frustrated spinel oxide - Dongjin Oh; Alexander Hampel; Joshua P. Wakefield; Peter C. Moen; Steef Smit; Xiangyu Luo; Marta Zonno; Sergey Gorovikov; Mats Leandersson; Craig Polley; Asish K. Kundu; Anil Rajapitamahuni; et al. (Proceedings of the National Academy of Sciences, 2025)