Abreha, Merhawi2018-06-292023-11-092018-06-292023-11-092007-07http://10.90.10.223:4000/handle/123456789/4969In the present study we study ferromagnetism of a transition free diluted magnetic semiconductor CaAs. Ferromagnetism in this curious material is due to the spin polarization of p-orbitals of the As atom. This mechanism is different from that of the CrAs in which Cr atoms possess magnetic moments [20, 23]. Ca atom does not have magnetic moments; its role is just to provide electrons with As atoms at the fcc site and to sustain crystal symmetry. The Curie temperature is estimated within an improvement over the mean-field approximation RKKY interaction for homogeneous systems with randomly distributed localized spins and is obtained to be approximately proportional to the spin concentrationenMagnetic Semiconductor CAASThesis