The anisotropy in the static magnetic susceptibility of bis-tetramethyltetraselenafulvalene hexafluoroarsenate [(TMTSF)2AsF6] has been investigated above and below the metal-to-insulator transition for a range of fields between 0.5 and 30 kG. The results are consistent with the expectations of a simple antiferromagnet with easy, intermediate, and hard axes close to the crystallographic b*, a, and c* directions. Below the transition temperature Tc=12 K, a spin-flop transition is seen. The temperature dependence of the spin-flop critical field Hc=4.5 kG is insignificant. Above the transition temperature, evidence for magnetic crossover is observed. The experimental results show (TMTSF)2X, X- = AsF6- and PF6- to be members of a family with quite similar physical properties. The data are discussed on the basis of Overhauser's treatment of itinerant antiferromagnetism.
Bibliographical noteCopyright (1982) by the American Physical Society.
Mortensen, K., Tomkiewicz, Y., & Bechgaard, K. (1982). Antiferromagnetism in the organic conductor bis-tetramethyltetraselenafulvalene hexafluoroarsenate [(TMTSF)2AsF6]: Static magnetic susceptibility. Physical Review B, 25(5), 3319-3325. https://doi.org/10.1103/PhysRevB.25.3319