Abstract
An organic conductor β″-(EDO-TTFVODS) 2FeBr 4(DCE) 0.5, where EDO-TTFVODS is ethylenedioxytetrathiafulvalenoquinone-1,3-diselenolemethide and DCE is 1,2-dichloroethane, has been synthesized and is expected to have a strong π–d interaction. It was found that the material is metallic down to about 4 K and shows a rather slight upturn of electrical resistivity ρ below this temperature. Temperature dependence of ρ in the slight upturn region is proportional to log T and weak negative magnetoresistance (−1.7%, 2 T) at 1.4 K also appears. Besides π–d interaction screened by conducting electrons in this material, weak localization and Kondo effect are also possible to explain this negative magnetoresistance. Oscillatory behavior probably due to a quasi-two-dimensional (Q2D) Fermi surface was observed in the field-orientation dependence, and k F‖ b′ was estimated to be 0.19 Å − 1.
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