^<13>C NMR Analyses of Successive Charge Ordering in (TMTTF)_2ReO_4(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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^<13>C NMR measurements were performed for a one-dimensional organic conductor, (TMTTF)_2ReO_4. The existence of an intermediate charge ordering (CO) phase was clarified for a TMTTF salt with a T_d symmetry counter anion by the ^<13>C NMR absorption line and spin-lattice relaxation rate, ^<13>C T^<-1>_1. The ^<13>C NMR spectra, which are characteristic of nuclei in equivalent molecules at room temperature, indicated two inequivalent molecules with unequal electron densities below 225K. Moreover, the spin-singlet transition associated with ReO_4 anion ordering was confirmed at around 158K by ^<13>C NMR. The ^<13>C NMR lines show a marked change at 158K. The possible redistribution of the electronic charge at the anion ordering temperature as well as the origin of the charge ordering phenomena are discussed.
社団法人日本物理学会の論文
2006-01-15