Inverse photoemission and resonant photoemission characterization of semimagnetic semiconductors

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Abstract
The new magnetotransport and magneto-optical properties of the semimagnetic Cd1−xMnxTe semiconductor alloy series depend critically on the nature of the Mn-derived d states. We examine here the electronic structure of these alloys with a combination of inverse photoemission spectroscopy, core-level photoemission line-shape analysis, valence-band resonant photoemission, and local density pseudofunction theory. The spectroscopic data reflect the local Mn–Te coordination and are in remarkable agreement with our one-electron calculations. We see no evidence of Mn-derived d states in the gap, and observe an experimental d↑–d↓ exchange splitting of 8.4±0.4 eV, i.e., almost twice as large as expected from earlier theoretical estimates. The ground-state configuration of Mn in the solid is primarily (d↑)(s↑)(p↑), and the super-exchange interaction has an important role in determining the stability of such a configuration relative to (d↑)5s2.

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