Ferromagnetism in Cr-Based Diluted Magnetic Semiconductors
J. Blinowski
Institute of Theoretical Physics, Warsaw University, Hoża 69, 00-681 Warszawa, Poland

P. Kacman
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland

and J.A. Majewski
Walter Schottky Institut, Technische Universität München, Am Coulombwall, 85748 Garching, Germany
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It has been recently established that in zinc chalcogenides with Cr2+ paramagnetic ions the p-d interactions are ferromagnetic. We clarify the origins of this property and make predictions concerning other Cr-based diluted magnetic semiconductors. The observation of the ferromagnetic p-d interaction resuscitated hopes for ferromagnetic d-d exchange interactions in diluted magnetic semiconductors. We have calculated the nearest-neighbor superexchange integrals in Cr-based diluted magnetic semiconductors. No simple correlation between the signs of p-d and d-d interactions has been found. Still, there are extended energy regions where the calculated superexchange is ferromagnetic and the act ual parameters of DMS with Cr2+ seem to match these regions.
DOI: 10.12693/APhysPolA.88.683
PACS numbers: 71.70.Gm, 75.50.Pp, 75.50.Dd