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- W1552904509 abstract "Among quasi-two-dimensional organic conductors, ${(text{BEDT-TTF})}_{2}X$, what form the two column structure of $ensuremath{alpha}$ or $ensuremath{theta}$ is thought to show a charge-ordering insulating state. The ${ensuremath{alpha}}^{ensuremath{'}}$ modification is the other candidate for a charge-ordering state. To determine the existence of a charge-ordering state and electron magnetism in the ${ensuremath{alpha}}^{ensuremath{'}}$ phase, which has a symmetry that differs from that of the $ensuremath{alpha}$ and $ensuremath{theta}$ phases, we utilized $^{13}text{C}text{-NMR}$ to examine ${ensuremath{alpha}}^{ensuremath{'}}text{ensuremath{-}}{(text{BEDT-TTF})}_{2}{text{IBr}}_{2}$ in which one side of the central carbon on the BEDT-TTF molecule is substituted with $^{13}text{C}$ nuclei. We observed changes in its spectrum at 200 K. The angular dependence of the NMR shift at 15 K indicated that the charge-ordering pattern is intracolumn disproportionation and the ratio of charge disproportionation on the spin-poor site and spin-rich sites is almost 1:0. The angle dependence of NMR spectrum at 60 K suggests that the hyperfine coupling tensor in the paramagnetic charge-ordering state is determined not only by the charge density of on-site molecules but also by the contribution of off-site molecules. The change in hyperfine coupling tensor must be taken into account in NMR studies of the paramagnetic CO state." @default.
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- W1552904509 date "2009-10-02" @default.
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- W1552904509 doi "https://doi.org/10.1103/physrevb.80.165103" @default.
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