This study reports the observation of large spin splitting in the g-wave type alternagnet CrSb. CrSb exhibits a high Néel temperature of 700 K and giant spin splitting near the Fermi level, making it a promising candidate for spintronics applications. Using high-resolution angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) calculations, the researchers mapped the three-dimensional electronic structure of CrSb. The results reveal that CrSb has a unique g-wave symmetry, with spin splitting reaching up to 0.93 eV near the Fermi level, the largest observed among all confirmed alternagnet materials. The study confirms that CrSb is a prototype g-wave alternagnet, with its spin splitting characteristics being distinct from other alternagnet materials. The research also highlights the potential of CrSb in spintronics due to its unique spin splitting and high Néel temperature. The findings provide important insights into the electronic structure and magnetic properties of alternagnet materials, and demonstrate the potential of CrSb as a platform for studying novel phenomena in the interplay of electronic and magnetic correlations.This study reports the observation of large spin splitting in the g-wave type alternagnet CrSb. CrSb exhibits a high Néel temperature of 700 K and giant spin splitting near the Fermi level, making it a promising candidate for spintronics applications. Using high-resolution angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) calculations, the researchers mapped the three-dimensional electronic structure of CrSb. The results reveal that CrSb has a unique g-wave symmetry, with spin splitting reaching up to 0.93 eV near the Fermi level, the largest observed among all confirmed alternagnet materials. The study confirms that CrSb is a prototype g-wave alternagnet, with its spin splitting characteristics being distinct from other alternagnet materials. The research also highlights the potential of CrSb in spintronics due to its unique spin splitting and high Néel temperature. The findings provide important insights into the electronic structure and magnetic properties of alternagnet materials, and demonstrate the potential of CrSb as a platform for studying novel phenomena in the interplay of electronic and magnetic correlations.