Highly Correlated Organic Conductor with Magnetic Anions Exhibiting a π-d Coupled Metal-Insulator Transition, λ -(BETS)_2FeBr_xCl_4-x (BETS = Bis(ethylenedithio)tetraselenafulvalene)

摘要

More detailed studies are needed to establish the spin structure model of λ-(BETS)_2FeCl_4. However, the enhanced electron correlation suggested by the resistivity measurement of λ-(BETS)_2FeBr_xCl_4-x and the simple consideration on the origin of the anomalous drop of M in λ-(BETS)_2FeCl_4 at T_MI indicate the important role of π-d coupling. The highly correlated organic conductor with magnetic anion will certainly be a fertile field to produce various new aspects of organic conducting systems.