Manganese-derived partial density of states in Cd1-xMnxTe.

Abstract

We have studied the contribution of Mn 3d states to the valence bands of ${\mathrm{Cd}}_{0.35}$${\mathrm{Mn}}_{0.65}$Te by means of the resonant enhancement of the Mn 3d photoionization cross section near the Mn 3${p}^{5}$3${d}^{6}$${(\mathrm{}}^{6}$P) core excitation (\ensuremath{\Elzxh}\ensuremath{\omega}=50 eV). The cross section of selected valence-band areas has a characteristic resonance shape as a function of photon energy that is well described by a Fano-type profile. From the strength of the resonance we conclude that there is appreciable hybridization with Mn 3d states throughout the valence bands. In addition, a new interpretation of the photoemission intensity with strong Mn 3d character that lies in the ionic gap of the CdTe valence bands is given. Based on an analysis of the final-state structure in terms of a configuration-interaction calculation performed on a ${\mathrm{MnTe}}_{4}$${\mathrm{}}^{6\mathrm{\ensuremath{-}}}$ cluster, we ascribe these features between 5 and 9 eV binding energy to ${d}^{4}$ final states (satellites), whereas the photoemission between 0 and 5 eV is due to Mn 3d multiplets where the ${d}^{4}$ final state is screened by charge transfer from the Te-derived valence-band states.