Resonant photoemission from Cd0.82Mn0.18Te single crystals at the Mn 2p->3d absorption threshold

The resonant photoemission of Cd0.82Mn0.18Te 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. (C) 2004 Elsevier B.V. All rights reserved.