Superconductor-to-Insulator Transition in an Organic Metal Incorporating Magnetic Anions:  λ-(BETS)₂(Fe_xGa_1-x)Cl₄ [BETS = bis(ethylenedithio)tetraselenafulvalene; x ≈ 0.55 and 0.43]

Organic Antiferromagnetic Metals Exhibiting Superconducting Transitions κ-(BETS)2FeX4 (X=Cl, Br): Drastic Effect of Halogen Substitution on the Successive Phase Transitions

“…Despite that -(BETS) GaCl without magnetic anions is a superconductor under ambient pressure, the isostructural crystal of -(BETS) FeCl undergoes a metal}insulator transition around 8 K below which a unique }d coupled antiferromagnetic insulating state develops (7,8). The mixed anion system, -(BETS) Fe \V Ga V Cl , shows an unprecedented superconductor-to-insulator transition (9,10). Furthermore, -(BETS) FeCl exhibits a superconducting transition at high pressure (11).…”

Development of Conductive Organic Molecular Assemblies: Organic Metals, Superconductors, and Exotic Functional Materials

“…610 Interestingly, the !-(BETS) 2 Fe x Ga 1Àx X 4 passes through a superconducting to insulating transition on cooling. 920 The -(BETS) (X = Cl and Br) (6) are antiferromagnetic superconductors, where the transition temperatures were T N ¼ 2:5 K and T c ¼ 1:1 K for the Br salt, and T N ¼ 0:45 K and T c ¼ 0:17 K for the Cl salt. 921 These organic/inorganic hybrid systems are summarized in Table 30, where a magnetic conductor exhibiting magnetic and conducting phenomena at different temperature regimes is also included (indicated by à ), since at this moment the definition of ''coexistence of multifunction'' is ambiguous.…”

Breakdown of the field-induced superconductivity by dynamical spin reversal

“…The sample was prepared by the electrochemical method as described elsewhere 14 , and needle-shaped single crystal is obtained. The crystallographic c*-axis corresponds to the needle axis.…”