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The high-temperature magnetic susceptibility of random, diluted magnetic systems is discussed for magnetic ions having not only spin momentum but also nonvanishing orbital momentum. In particular, the magnetic susceptibility of Zn_1-x{Fe}ₓ$Se (${Fe}²⁺$, S=2,L+2) is reported in the temperature range 2--300 K. The nearest-neighbor Fe-Fe exchange interaction is estimated as ${J}_{NN/{k}B}$ =-22 K for ${Zn}_{1{{-}}x}FeₓSe and J_NN/kB=-17.8 K for Cd_1-x{Fe}ₓ$Se.
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Twardowski et al. (1988) studied this question.
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