Study Of Ferromagnetism In Diluted Magnetic Semiconductor Caas

In the present study we study ferromagnetism of a transition free diluted magneticrnsemiconductor CaAs. Ferromagnetism in this curious material is due to the spinrnpolarization of p-orbitals of the As atom. This mechanism is different from thatrnof the CrAs in which Cr atoms possess magnetic moments [20, 23]. Ca atom doesrnnot have magnetic moments; its role is just to provide electrons with As atoms atrnthe fcc site and to sustain crystal symmetry. The Curie temperature is estimatedrnwithin an improvement over the mean-field approximation RKKY interaction for homogeneousrnsystems with randomly distributed localized spins and is obtained to bernapproximately proportional to the spin concentration

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