Abstract
Magnetic properties in the quasi-one-dimensional organic salt, (TMTTF)${}_{2}$SbF${}_{6}$, where TMTTF is tetramethyltetrathiafulvalene, are investigated by ${}^{13}$C NMR under pressures. Antiferromagnetic phase transition at ambient pressure (AFI) is confirmed. Charge ordering is suppressed by pressure and is not observed under 8 kbar. For $5<P<20$ kbar, a sharp spectrum and the rapid decrease of the spin-lattice relaxation rate $1/{T}_{1}$ were observed below about 4 K, which is attributed to a spin-gap transition. Above 20 kbar, an extremely broadened spectrum and a critical increase of $1/{T}_{1}$ were observed. This indicates that the system enters into another antiferromagnetic phase (AFII) under pressure. The slope of the antiferromagnetic phase transition temperature ${T}_{\mathrm{AFII}}$, $d{T}_{\mathrm{AFII}}/dP$, is positive, while ${T}_{\mathrm{AFI}}$ decreases with pressure. The magnetic moment is weakly incommensurate with the lattice at 30 kbar.
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