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Simple Two‐Band s–d Model for Ferromagnetic Semiconductors with Hybridization. II. Further Development and Optical Properties
Author(s) -
Szőcs V.,
Čápek V.,
Velický B.
Publication year - 1981
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221030114
Subject(s) - spurious relationship , condensed matter physics , semiconductor , absorption edge , ferromagnetism , conduction band , valence (chemistry) , magnetic semiconductor , physics , band gap , mathematics , quantum mechanics , electron , statistics
The two‐band model of electronic states proposed previously for the conduction band of some types of ferromagnetic semiconductors like chromium chalkospinels is discussed and used to prove the significance of the higher order spin‐flip processes. On the basis of this model a simple valence‐to‐conduction band absorption is investigated at a level of the self‐consistent CPA. The inadequacy of such mechanism for the explanation of the absorption edge at least in CdCr 2 Se 4 is shown. The lowest order mean‐field approach to the d‐states is illustrated to yield a spurious agreement with the experiment.