Abstract

Abstract Energy bands of organic conductors are calculated on the basis of the estimation of intermolecular overlap integrals and the tight-binding approximation. The resulting Fermi surface has been investigated by the measurements of low-temperature magnetoresistance in detail. However, we have to take electron correlation into account to explain the variation of the metal-insulator transition temperatures and the universal phase diagram. In particular, intermolecular Coulomb repulsion gives a variety of charge-order patterns, in which non-stripe charge order is important in a triangular network of organic conductors. Non-stripe charge order is an origin of flat resistivity, nonlinear conductivity, and potentially Dirac fermions. The estimation of intermolecular interaction is extended to the πd-systems, where the magnetic interactions J between the π-electrons and metal spins make a network. To discuss the charge transport in organic transistors, energy levels of the molecules are important. However, since the energy levels are considerably modified at the metal/organic interface, it is useful to use chemical doping and organic charge-transfer salts in the conducting parts of organic transistors. Temperature dependence of an organic transistor comes from the midgap trap states, but eliminating the traps in a single-crystal transistor, we can achieve band-like transport maintained down to low temperatures.

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