  Anomalous resistive peaks below the superconducting transition temperature in
heavily boron doped nanocrystalline diamond films could have potential
application in switching devices, however the exact origin is still under
study. We establish a temperature dependence of this resistive phase similar to
what has been reported for in Josephson junction arrays and other granular
superconductors where the charge duel of the Berezinskii-Kosterlitz-Thouless
(BKT) transition has been observed. Non-linear magnetoresistance with a
temperature dependent peak feature below the critical field are also presented.
Pronounced temperature dependent hysteresis in the current voltage sweeps at
temperatures below the determined BKT critical point are related to pinning of
charge defects. It is shown that these collective features allude to a
Charge-BKT transition between charge and anti-charge analogues.
