Abstract
(DMET) 2 FeBr 4 is an organic conductor whose structure consists of an alternate stacking of ID chain-based donor layers and magnetic Fe 3+ (S=5/2) square lattices. The electronic structure of the π-electrons is metallic with a Ml transition at T MI ∼40K, while Fe 3+ spins undergo an antiferromagnetic transition at T N =3.7K. The magnetization curves which show field-direction-dependent anomalies in addition to a spin-flop transition arc demonstrated to have a participation of donor π-electron spins in the magnetization processes. The magnetoresistances snow a strong correlation with the detailed behaviour of the magnetizations, suggesting an important role of the interaction between π- and d-electrons existing on adjacent layers.
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