Resonant photoemission from Cd 0.82Mn 0.18Te single crystals at the Mn 2p → 3d absorption threshold

Abstract

The resonant photoemission of Cd 0.82Mn 0.18Te single crystals has been studied in the vicinity of the Mn 2p → 3d absorption threshold. A clear resonant behavior is detected for valence band states at the Mn 2p → 3d absorption threshold, while a weak normal Auger emission is singled out in the valence band region for photon energies well above the main absorption edge. Resonant Raman–Auger and normal Auger emissions are found to coexist above the absorption edge. This effect is ascribed to the presence of a manifold of localized states arising from the Mn 2p → 3d Coulomb and exchange interaction, which prevents the delocalization in the intermediate state of the autoionization process and favors the Raman–Auger process.