  In our previously published work, we have reported colossal
magnetoresistance, Andreev oscillations, ferromagnetism, and granular
superconductivity in oxygen-implanted carbon fibers, graphite foils, and highly
oriented pyrolytic graphite. In this follow-up research, more results on these
oxygen-implanted graphite samples are presented. We show results from transport
measurements on oxygen-implanted diamond-like carbon thin coatings, amorphous
carbon films, and highly oriented pyrolytic graphite. Significantly, a
three-order magnitude drop in the electrical resistance of the oxygen-implanted
diamond-like carbon films is observed at the 50 K temperature that we have
previously reported for the transition to the superconducting state. Below 50
K, the films resistance oscillates between the high and low resistance states,
less when the sample is under a transverse magnetic field. This metastability
between the insulating and superconducting-like states possibly reflects the
evolution of the amplitude for the superconducting order parameter also known
as the longitudinal Higgs mode. Transitions to low resistance state and
metastability are also observed for amorphous carbon films. Finally, the highly
oriented pyrolytic graphite samples resistance have a thermally activated term
that can be understood on the basis of the LAMH model applied to narrow SC
channels in which thermal fluctuations can cause phase slips. We also find that
in oxygen-implanted carbon materials, the electron charge and spin correlations
do not compete and their interplay rather facilitates the emergence of
high-temperature superconductivity, and thus, additional unexpected effects
like Heisenberg spin waves and magneto-structural transitions are observed.
