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An investigation of the P/T phase diagram of the quarter-filled organicconductors, [EDT-TTF-CONMe2]2X, is reported on the basis of transport and NMRstudies of two members, X=AsF6 and Br of the family. The strongly insulatingcharacter of these materials in the low pressure regime has been attributed toa remarkably stable charge ordered state confirmed by 13C NMR and the onlyexistence of 1/4 Umklapp e-e scattering favoring a charge ordering instead ofthe 1D Mott localization seen in (TM)2X which are quarter-filled compounds withdimerization. A non magnetic insulating phase instead of the spin density wavestate is stabilized in the deconfined regime of the phase diagram. Thissequence of phases observed under pressure may be considered as a genericbehavior for 1/4-filled conductors with correlations.

Phase diagram of quarter-filled band organic salts, [EDT-TTF-CONMe2]2X, X = AsF6 and Br