Abstract
Charge disproportionation (CD) recently observed in many organic conductors is reviewed. CD is closely related to the charge ordering (CO) but is observed even when no long range CO is established. In a 0-phase BEDT-TTF salt, (BEDT-TTF) 2 RbZn(SCN) 4 , an extremely slow dynamics of CD has been observed above T MI . A similar phenomenon is also observed in the Cs-analog, (BEDT-TTF)2CsZn(SCN)4. However, a spin-singlet ground state without CD is suggested in this salt at low temperatures. It is shown that α-(BETS) 2 I 3 exhibits CD at low temperatures, as in α-(BET-TTF) 2 I 3 . Recently, an abnormal line broadening has been observed in 13 C-NMR of (TMTSF) 2 FSO 3 under pressure as well as in 77 Se-NMR of λ-(BETS) 2 FeCl 4 in a high field. We expect that both are very likely caused by a large CD among the organic molecular sites.
Published Version
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