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The conditions for molecular orientation of electrochemically synthesized polythiophene have been investigated. The polymer chains are preferentially oriented along the film surface direction, i.e. parallel to the electrode surface, under conditions of (a) polymerization around the freezing point of the solvent used in the electrolyte, and (b) polymerization at low current density (below 1 mA/cm ...
The first order metal-insulator transition of the mixed-valent conductor DCNQI-Cu salt has been studied theoretically by applying the slave boson method to the periodic Anderson model with the electron-phonon interaction. It is shown that both the lattice distortion and the local spin with three-fold periodicity appear simultaneously at the transition.
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