Se-77-Nmr Study Of Quasi-One Dimensional Organic Conductor (Tmtsf)(2)X

Quasi-one dimensional organic conductor (TMTSF)(2)X with octahedral anions X = PF6, AsF6,and SbF6 have been studied by NMR measurements at the Se-sites which are substantially responsible for conductivity in this system. Close resemblances in the temperature dependence of the spin-lattice relaxation rate 1/T-1 and the evolution of internal field in the SDW state were observed in the three measured compounds. The existence of the sub-phases in the SDW phase of all these compounds, which is evidenced by T-1 but not from spectrum measurements, indicates that this is a common feature among (TMTSF)(2)X system with an incommensurate SDW wave number and is associated with dynamic property rather than static one.