13C NMR study of the magnetic properties of the quasi-one-dimensional conductor, (TMTTF)2SbF6

Abstract

Magnetic properties in the quasi-one-dimensional organic salt (TMTTF)2SbF6 are investigated by 13C 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/T1 were observed below about 4 K, attributed to a spin-gap transition. Above 20 kbar, extremely broadened spectrum and critical increase of 1/T1 were observed. This indicates that the system enters into another antiferromagnetic phase (AFII) under pressure. The slope of the antiferromagnetic phase transition temperature T_AFII, dT_AFII/dP, is positive, while T_AFI decreases with pressure. The magnetic moment is weakly incommensurate with the lattice at 30 kbar.

arXiv comment8 pages, 9 figures, to appear in Phys. Rev. B

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• Correlation-driven electronic multiferroicity in (TMTTF)${}_2$-$X$ organic crystals
• Comprehensive $ab$ $initio$ investigation of the phase diagram of quasi-one-dimensional molecular solids
• Comment on "Tuning the Magnetic Dimensionality by Charge Ordering in the Molecular TMTTF Salts"
• Charge- and anion-orderings in the quasi-one-dimensional organic conductor (TMTTF)${}_2$NO${}_3$