  In this work, we have studied the effects from increasing the strength of the
applied electric field on the charge transport of hydrogenated graphitic
fibers. Resistivity measurements were carried out for direct currents in the nA
- mA range and for temperatures from 1.9 K to 300 K. The high-temperature
non-ohmic voltage-current dependence is well described by the nonlinear random
resistor network model applied to systems that are disordered at all scales.
The temperature-dependent resistivity shows linear, step-like transitions from
insulating to metallic states as well as plateau features. As more current is
being sourced, the fiber becomes more conductive and thus the current density
goes up. The most interesting features is observed in high electric fields. As
the fiber is cooled, the resistivity first decreases linearly with the
temperature and then enters a plateau region at a temperature T ? 260 ? 280 K
that is field-independent. These observations on a system made out of carbon,
hydrogen, nitrogen, and oxygen atoms suggest possible electric-field induced
superconductivity with a high critical temperature that was predicted from
studying the role of chirality on the origin of life [1].
