13C NMR investigation of re-entrant antiferromagnetic states of (TMTTF)2SbF6

Abstract

13C nuclear magnetic resonance (NMR) investigations were performed on the one-dimensional organic conductor (TMTTF)2SbF6 to clarify its electronic properties in the proximity of the ground states. An abrupt broadening of 13C NMR absorption lines below 8 K (TN = 8 K), confirmed a long-range antiferromagnetic phase transition. Below TN, the absorption lines are composed of four distinct broad lines, indicating a commensurate magnetic structure. The amplitude of staggered magnetization, ρ, is comparable to (TMTTF)2Br, and on the order of 0.1 μB according to the splitting of 13C NMR lines at 3 K.