Inverse photoemission and resonant photoemission characterization of semimagnetic semiconductors
The new magnetotransport and magneto-optical properties of the semimagnetic Cd/sub 1-//sub x/Mn/sub x/Te 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 dup-arrow--darrow-down 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 (dup-arrow)(sup-arrow)(pup-arrow), and the super-exchange interaction has an important role in determining the stability of such a configuration relative to (dup-arrow)/sup 5/s/sup 2/.
- Research Organization:
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
- OSTI ID:
- 6291747
- Journal Information:
- J. Vac. Sci. Technol., A; (United States), Vol. 7:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CADMIUM TELLURIDES
ELECTRONIC STRUCTURE
MANGANESE TELLURIDES
BINARY ALLOY SYSTEMS
D STATES
EMISSION SPECTROSCOPY
FERMI LEVEL
MAGNETIC SEMICONDUCTORS
PHOTOEMISSION
VALENCE
ALLOY SYSTEMS
CADMIUM COMPOUNDS
CHALCOGENIDES
EMISSION
ENERGY LEVELS
MANGANESE COMPOUNDS
MATERIALS
SECONDARY EMISSION
SEMICONDUCTOR MATERIALS
SPECTROSCOPY
TELLURIDES
TELLURIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties