Magnetic and Transport Properties of Organic Radical Ion Salts Containing Metal Ions

Abstract

Two isomorphous TMTSF cation radical salts with tetrachlorometalate anion, TMTSF·FeCl₄ (ρ_rt = 40 Ωcm), and TMTSF·GaCl₄ (ρ_rt = 20 Ωcm) were prepared. The crystal containing tetrachloroferrate anion undergoes an antiferromagnetic ordering below Tn = 4K with the easy axis perpendicular to the TMTSF stacking direction. X-ray crystallographic analysis of the crystal reveals that Cl atoms of the anions closely contact with Se atoms of the donor molecules and suggests that the spin ordering is mediated by magnetic interaction between donors and anions.