The ac magnetic measurements on an organic metal, κ-(BETS)2FeCl4 down to 60 mK revealed successive antiferromagnetic and superconducting phase transitions at about 0.65 K (≈TN) and 0.1 K (≈TC), respectively. These transitions correspond to the similar transitions in the Br-analogue, κ-(BETS)2FeBr4 but the transition temperatures of FeCl4 system are significantly lower than those of FeBr4 system (TN = 2.5 K; TC = 1.1 K).
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Otsuka et al. (2000) studied this question.
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