Abstract
Recently the systematic band-filling control has been successfully carried out in organic conductors. The filling control to the various ground state was investigated by doping to the antiferromagnetic insulator for λ-ET 2 (MCl 4 ) 1-x (M'Cl 4 ) x , the non-magnetic insulator, δ'-ET 2 (MCl 4 ) 1-x (M'Cl 4 ) x , the charge ordered conductor, α-ET 3 (M'Cl 4 ) 1-x (MCl 4 ) x (TCE), and the band insulator β'-ET 3 (M'Cl 4 ) 2-x (MCl 4 ) x [M = Ga, Fe, M' = Co, Zn], respectively. The most drastic change was observed for β'-ET 3 (M'Cl 4 ) 2-x (MCl 4 ) x : the semiconducting behavior transforms to the metallic one from x = 0, 0.66, to 0.58. Moreover, by applying the pressure for x = 0.62, the metallic behavior was observed down to 4 K. On the other hand, the electronic state of the band-filled conductor with magnetic anions is also attractive. The ferromagnetic interaction through the doped carriers was observed for β'-ET 3 (CoCl 4 ) 2-x (FeCl 4 ) x .
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