The electrical and magnetic properties of a series of magnetic organic conductors, ϰ-(BETS)2FeBrxCl4–x [BETS = bis(ethylenedithio)tetraselenafulvalene], are presented. By collecting the experimental results of the electrical resistivities and magnetic susceptibilities, the temperature vs. x-value phase diagram of ϰ-(BETS)2FeBrxCl4-x (0 ≤ x ≤ 4) has been obtained. It is shown that the magnetic interaction tends to decrease with increasing Cl content, suggesting the importance of the intermolecular magnetic interaction through the Br atom.
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Fujiwara et al. (2002) studied this question.