Commensurability of the spin-density-wave state of (TMTSF)₂PF₆ observed by ¹³C-NMR

Sanato Nagata, Masaki Misawa, Yoshihiko Ihara, and Atsushi Kawamoto

Accepted Tuesday Mar 26, 2013

A spin-density-wave (SDW) for (TMTSF)2PF6 has been reported to appear below TSDW ( @ 12 K), with a subphase transition at T* ( @ 4 K). To determine the structure of the subphase, we synthesized (TMTSF)2PF6, in which one side of the central carbon bond in each TMTSF molecule was replaced by 13C, and utilized this compound in 13C nuclear magnetic resonance (NMR) measurements. Below TSDW, the spectrum became broad and T1-1 decreased, in agreement with previous results. Below T*, fine structures emerged in the center of the spectrum and T1-1 decreased exponentially. These phenomena were attributed to the emergence of commensurability at T*.