Moderate electron correlation in altermagnet CrSb

Electron correlation effects in 3 d transition-metal compounds often play an important role in shaping their low-energy electronic properties. Here, using high-resolution angle-resolved photoemission spectroscopy, we investigate the electronic correlation behavior of CrSb, an altermagnetic material. Our measurements reveal the three-dimensional electronic structure of CrSb. A band splitting of about 1.1 eV is observed, consistent with previous reports. The comparison between experiment and density functional theory calculations shows renormalization factors of approximately 1.22–1.45 near the Fermi level, indicating moderate electron correlations. Notably, the renormalization is found to be momentum-dependent and band-dependent. These results provide insight into the role of electron correlations in altermagnetic CrSb and their reshaping of the low-energy electronic structure, which may be relevant for understanding its electronic properties and potential applications.