Magnetic scattering of spin polarized carriers in (In,Mn)Sb dilute magnetic semiconductor

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Magnetoresistance measurements on the magnetic semiconductor (In,Mn)Sb suggest that magnetic scattering in this material is dominated by isolated Mn²⁺ ions located outside the ferromagnetically-ordered regions when the system is below Tc. A model is proposed, based on the p-d exchange between spin-polarized charge carriers and localized Mn²⁺ ions, which accounts for the observed behavior both below and above the ferromagnetic phase transition. The suggested picture is further verified by high-pressure experiments, in which the degree of magnetic interaction can be varied in a controlled way.