Magnetic Properties of the Organic Conductor bis-Tetramethyltetraselenafulvalene Hexafluorophosphate [(TMTSF)2PF6]: A New Phase Transition

Abstract

Magnetic susceptibility measurements on the organic conductor ${\mathrm{}\left(\mathrm{TMTSF}\right)\mathrm{}}_2$P${\mathrm{F}}_6$ reveal a new phase transition at 11.5 K. At lower temperature the magnetic response is nonlinear, being more diamagnetic below 6 kOe than at higher fields. At the metal-insulator transition (∼17 K) there is no visible anomaly in the static susceptibility, in contrast to the rapid disappearance of the electron-spin-resonance intensity.