NMR investigation of (TMTTF)2Br: charge configurations and spin dynamics

We performed 13C NMR study for a quasi-one-dimensional organic conductor (TMTTF)2Br. Although the resistivity has its minimum value around 100 K, the NMR spectra showed no significant change down to 30 K. Instead, we found slight broadening of the spectra above the magnetic phase transition temperature (TN∼15 K). Similar anomaly is also observed for the uniform susceptibility (χs).