MAGNETIC PROPERTIES OF TTF-TYPE CHARGE TRANSFER SALTS IN THE MOTT INSULATOR REGIME
作者： Naoki Yoneyama , Akira Miyazaki , Toshiaki Enoki , Gunzi Saito
DOI: 10.1246/BCSJ.72.639
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摘要: We have investigated the magnetic properties of several TTF-based Mott insulators consisting dimerized/trimerized-donor units, which are classified into three subgroups: (1) β′-(BEDT-TTF)2X (X = ICl2, AuCl2) and (BEDT-TTF)2GaCl4 as strong dimer systems, (2) α′-(BEDT-TTF)2IBr2 salt a weak system, (3) (BMDT-TTF)3ClO4(1,2-dichloroethane) (BMDT-TTF)3AsF6(1,1,2-trichloroethane) trimer systems. The group compounds localized spin systems with an S 1/2 per unit. In (2), dimerization produces fractional moment, reflects delocalization electrons, although magnetism is described in terms low-dimensional antiferromagnet. ClO4 indicates existence trimer, whereas trimerization quite weak, because inter-trimer Coulomb interactions generate charge disproportionation resulting localization electrons. absence dis...
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