Abstract
Using the one-dimensional quarter-filled Heisenberg-Kondo lattice model for a π-d electron system, CoPc(AsF 6 ) 0.5 , we study the effects of long-range Coulomb interaction among π electrons on the conductivity. The density-matrix renormalization-group method is employed. As a first step, we regard the localized spins of d electrons as classical ones, and then, as quantum S=1/2 spins, which are coupled antiferromagnetically with each other. In the former case, d electrons produce a static staggered magnetic field for π electrons. It is pointed out that the next-nearest-neighbor repulsion among π electrons and the magnetic coupling between π and d electrons are essential to open a charge gap.
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