EXCHANGE INTERACTIONS BETWEEN LOCALIZED AND DELOCALIZED ELECTRONS IN SEMIMAGNETIC COMPOUNDS

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Abstract
In this paper we report magneto-optical measurements performed on the semi-magnetic ternary random alloys Hg1-kMnkTe (k<0.15) and Cd1-x MnxTe (x<0.5). In Cdl-xMnxTe compounds sharp magneto-rerlectivity structures are associated with excitonic transitions. Narrow or zero gap Hg1-kMnkTe alloys exhibit a pronounced Landau quantization leading to oscillatory magneto-transmission patterns connected with inter Landau levels transitions. In both kinds of compounds a dramatic increase of the spin properties of mobile carriers is observed which is strongly temperature dependent at low temperatures (T = 4.2 K and T = 2K). All the spectra are quantitatively interpreted by including the s-d and p-d exchange interaction between the mobile carriers and the localized d electrons of Mn2+ ions (first order effect). The exchange integrals in s and p bands are obtained and the magnetization of the d electrons can be optically measured. An antiferromagnetic interaction between M2+ localized spins is clearly evidenced in both series of alloys

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