Successive antiferromagnetic and superconducting transitions in an organic metal, kappa-(BETS)(2)FeCl4

Otsuka T; Kobayashi A; Miyamoto Y; Kiuchi J; Wada N; Ojima E; Fujiwara H; Kobayashi H

Chemistry Letters, Vol.29, No.7, 732-733, 2000

Otsuka T, Kobayashi A, Miyamoto Y, Kiuchi J, Wada N, Ojima E, Fujiwara H, Kobayashi H

The ac magnetic measurements on an organic metal, kappa- (BETS)(2)FeCl4 down to 60 mK revealed successive antiferromagnetic and superconducting phase transitions at about 0.65 K (approximate to T-N) and 0.1 K (approximate to T-C), respectively. These transitions correspond to the similar transitions in the Br-analogue, kappa-(BETS)(2)FeBr4 but the transition temperatures of FeCl4 system are significantly lower than those of FeBr4 system (T-N = 2.5 K; T-C = 1.1 K).