Abstract
We have examined several new types of molecular metals including three new superconductors, θ-(BEDT-TTF) 2I 3, κ-(BEDT-TTF) 2I 3 and [(CH 3) 4N] [Ni(dmit) 2] 2. According to our molecular designing analyses based on simple tight-binding band calculations, there are two ways to avoid the metal-insulator transition encountered in one-dimensional (1D) systems. They are to design (1) 2D metals and (2) “multi-Fermi surfaces systems”. The 2D layered molecular superconductors, θ- and κ-(BEDT-TTF) 2I 3, Ni(dmit) 2 superconductors and magnetic molecular metals, R 1,R 2-DCNQI 2Cu(R 1, R 2=CH 3, CH 3O, Br, Cl) are described from the molecular designing point of view.
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