We have studied the electronic structure of FeSi by high-resolution photoemission. At room temperature the spectra show no energy gap while a gap opening was observed below ∼150 K accompanied by the gradual paramagnetic-to-nonmagnetic transition. From analysis of the spectral lineshape using a model self-energy, we find that considerable band narrowing occurs near the band edge, probably due to electron correlation, giving a qualitative explanation to the unusual electronic and magnetic properties.
- A. semiconductors
- D. electron-electron interactions
- E. photoelectron spectroscopies
- electronic band structure
ASJC Scopus subject areas
- Condensed Matter Physics
- Materials Chemistry