Author/Authors :
Enoki، نويسنده , , T. and Yamazaki، نويسنده , , Daniel H. and Okabe، نويسنده , , K. and Enomoto، نويسنده , , K. and Kato، نويسنده , , T. and MIYAZAKI، نويسنده , , A. and Ogura، نويسنده , , E. and Kuwatani، نويسنده , , Y. and Iyoda، نويسنده , , M.، نويسنده ,
Abstract :
Unconventional magnetic features are reported in charge-transfer complex-based molecular magnets. Quasi-1D metals (DMET)2FeBr4, (EDTDM)2FeBr4 and semiconductor (EDS–TTF)2FeBr4 are isostructural with alternating stacking of donor π-electron conducting sheets and square lattice d-spins of FeBr4− anion sheets. The former two undergo an SDW transition at 15–40 K. For (DMET)2FeBr4, the magnetoresistance is strongly affected by Fe3+ spin arrangement, suggesting strong π–d interaction. Quasi-1D metal (EDO–TTFBr2)3I3 undergoes an MI transition around TMI∼150 K. The susceptibility is featured with 1D antiferromagnetic (AF) system with fractional magnetic moments. It takes a 3D AF ordered state below TN=15 K. The co-existence of metallic conduction and localised moments evidences features of strongly correlated electron system in the MI boundary.
Keywords :
?–d Interaction , Highly correlated system , magnetoresistance , Charge transfer complex , Organic metal , Low-dimensional electronic system
