Abstract:The electronic state of two-dimensional organic conductor, $\ensuremath{\theta}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{Cs}\mathrm{Zn}{(\mathrm{S}\mathrm{C}\m...The electronic state of two-dimensional organic conductor, $\ensuremath{\theta}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{Cs}\mathrm{Zn}{(\mathrm{S}\mathrm{C}\mathrm{N})}_{4}$, has been investigated by means of $^{13}\mathrm{C}\text{\ensuremath{-}}\mathrm{NMR}$ line shape analyses on selectively $^{13}\mathrm{C}$-enriched single crystal sample. Strong charge disproportionation was found to develop in the ``metallic'' state well above metal-insulator transition temperature of $\ensuremath{\sim}20\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The charge disproportionation becomes almost static below $\ensuremath{\sim}140\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, forming a short-range charge ordering, but no long-range ordering is stabilized at low temperatures down to $5\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. About half of the molecular sites become nonmagnetic, while the other half carries finite magnetic moments. Charge disproportionation becomes very much reduced at least at the nonmagnetic molecular sites, implying that charge rearrangement occurs at $\ensuremath{\sim}20\phantom{\rule{0.3em}{0ex}}\mathrm{K}$.Read More
Publication Year: 2008
Publication Date: 2008-03-10
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 22
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