Takegami, D., Nakamura, M., Melendez-Sans, A., Fujinuma, K., Nakamura, R., Yoshimura, M., et al. (2024). Negative charge-transfer energy in SrFeO3 revisited with hard x-ray photoemission spectroscopy. Physical Review B, 109: 235138, pp. 1-7. doi:10.1103/PhysRevB.109.235138.