Direct probe of Mott-Hubbard to charge-transfer insulator transition and electronic structure evolution in transition-metal systems

Article

关键词: X-RAY-ABSORPTION;    BAND-GAPS;    PHOTOELECTRON-SPECTROSCOPY;    PHOTOEMISSION SPECTRA;    NIO;    FLUORINE;    OXIDES;    3D;    DIFLUORIDES;    SATELLITES;   

DOI  :  10.1103/PhysRevB.83.241102

来源: SCIE

【 摘 要 】

We report the most direct experimental verification of Mott-Hubbard and charge-transfer insulators through x-ray emission spectroscopy in transition-metal (TM) fluorides. The p-d hybridization features in the spectra allow a straightforward energy alignment of the anion-2p and metal-3d valence states, which visually shows the difference between the two types of insulators. Furthermore, in parallel with the theoretical Zaanen-Sawatzky-Allen diagram, a complete experimental systematics of the 3d Coulomb interaction and the 2p-3d charge-transfer energy is reported and could serve as a universal experimental trend for other TM systems including oxides.

【 授权许可】

Free