The Ferromagnetic p-d Exchange in Diluted Magnetic Semiconductors
J. Blinowski
Institute of Theoretical Physics, Warsaw University, Hoża 69, 00-681 Warszawa, Poland

T. Dietl and P. Kacman
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
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The antiferromagnetic type of the interaction between the Γ8-band electrons and the Mn2+ ions in AIIBIV diluted magnetic semiconductors has been explained by invoking the p-d hybridization mechanism. In this paper it is shown that for particular electronic configurations of the magnetic ions in diluted magnetic semiconductors the p-d hybridization can lead to a ferromagnetic interaction between the valence-band electrons and the localized spins. This happens when all the one-electron d-orbitals which hybridize with p-band states are empty (e.g., as in Sc2+ and Ti2+ ions). The appropriate p-d Hamiltonian is derived and the ferromagnetic exchange constants are evaluated.
DOI: 10.12693/APhysPolA.82.641
PACS numbers: 75.50.Pp, 75.30.-m, 71.70.-d