Charge Transport in the Organic Conductor Quinolinium Ditetracyanoquinodimethanide [Qn(TCNO)2]

Abstract

Proton spin-lattice relaxation-time ($T_1$) measurements are reported in pure and in neutron-irradiated organic conductor Qn${\mathrm{}\left(\mathrm{TCNQ}\right)\mathrm{}}_2$. The diffusion constant $D$ (evaluated from $T_1$) and conductivity $\sigma$ have the same dependence on the irradiation-induced impurity concentration, showing that charge propagation is responsible for the relaxation time. The temperature dependence of $D$, when compared with $\sigma \mathrm{}\left(T\right)\mathrm{}$, suggests that the conductivity is determined by the temperature-dependent mobility.