Energy Spectra of Magnetic Semiconductors: Eu Chalcogenides and NiO

Abstract

The energy spectra of EuO and EuSe have been calculated based on atomic spectra and the pure ionic crystal model. The relative position of each level is consistent with that proposed previously by Kasuya and Yanase to interpret magnetic, optical and electrical properties of Eu chalcogenides. Furthermore, quantitative agreement with experiment is satisfactory. A similar calculation for NiO leads to the following predictions: (1) For Li‐doped samples conduction occurs in the 3d band. (2) The first band‐to‐band transition is from 3d⁸ to 4s states in contrast to the accepted assignment 2p to 3d⁹. The latter transition corresponds to the large broad absorption peak near 16 eV.