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Two types of BETS conductors are reported. Needle crystals of λ-BETS2GaXxY4-x gave a series of new superconductors: λ-BETS2GaCl4 (Tc=7 K), λ-BETS2GaBrCl3 (8 K), λ-BETS2GaCl3F (3.5 K), λ-BETS2GaBr0.5Cl3.5 (6.5 K). λ-BETS2GaBr1.5Cl2.5, which is a semiconductor at 1 bar, exhibited a superconducting transition at 8 K and ca. 1 kbar. Pressure and temperature dependencies of the resistivities of λ-BETS2GaXxY4-x closely resemble those of κ-type BEDT-TTF superconductors. Many BETS metals with magnetic ions (Fe3+, Mn2+, Co2+, Cu2+) were prepared. Among them, κ-type MX4 (M=Fe, Co; X=Cl, Br) salts and θ-type Cu2Cl6 salts are metallic down to at least 4 K. The static susceptibility of λ-BETS2FeCl4 shows a characteristic magnetic field dependence below its metal-insulator transition temperature.
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Kobayashi et al. (1996) studied this question.
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