Abstract
The charge transport properties of a partially oxidized salt composed of Co(Pc)(CN) 2 units with a typical one-dimensional electronic system have been suggested to be determined by charge disproportionation. The current–voltage ( I – V ) characteristics show nonlinear behavior at low temperature, which is suppressed by applying pressure. The observed nonlinearity is considered to result from the electric-field-induced delocalization of carriers in the charge disproportionation state. In the isomorphous magnetic Fe(Pc)(CN) 2 system, the nonlinear behavior is observed at higher temperatures, suggesting that charge disproportionation is more developed in a system with local moments. The threshold voltage of negative differential resistance decreases when an external magnetic field is applied, confirming that the localization of charge carriers is released by magnetic field application.
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