Electronic structure of Zn1-xMnxTe.

Abstract

The electronic structures of ZnTe and ${\mathrm{Zn}}_{0.7}$${\mathrm{Mn}}_{0.3}$Te have been investigated by means of synchrotron-radiation photoemission experiments. Te 4d core-yield spectra of ZnTe and ${\mathrm{Zn}}_{0.7}$${\mathrm{Mn}}_{0.3}$Te reflect the density of states (DOS) of the conduction bands. The two DOS peaks in the ZnTe spectrum observed at 0.6 and 4.3 eV above the conduction-band minimum are ascribed to relatively flat regions of the conduction bands near the ${\mathit{L}}_{1}$ and ${\mathit{X}}_{1}$, and the ${\mathrm{\ensuremath{\Gamma}}}_{15}$ and ${\mathit{L}}_{3}$, symmetry points, respectively. The contribution of the Mn 3d states to the valence bands of ${\mathrm{Zn}}_{0.7}$${\mathrm{Mn}}_{0.3}$Te has been evaluated by means of resonant enhancement of Mn 3d photoionization cross section near the Mn 3p-3d core excitation. The Mn 3d\char21{}derived partial DOS of ${\mathrm{Zn}}_{0.7}$${\mathrm{Mn}}_{0.3}$Te is found to be very similar to that of ${\mathrm{Cd}}_{0.8}$${\mathrm{Mn}}_{0.2}$Te. This suggests nearly equal Mn-Te bond lengths in these ternary alloys.