  Results of magnetic force microscopy (MFM), dc SQUID magnetization, reversed
Josephson effect (RJE), and resistance measurements in thin carbon arc (CA)
films are presented. The observation of a RJE induced voltage as well as its rf
frequency, input amplitude, and temperature dependence reveals the existence of
Josephson Junction arrays. Oscillating behavior of the DC SQUID magnetization
reminiscent of the Fraunhofer-like behavior of superconducting (SC) critical
current in the range of 10000 Oe has been observed. The dc SQUID magnetization
measurement indicates a possible elementary 102 nm SC loop; this is compared to
MFM direct observations of magnetic clusters with a median size of 165 nm. All
these data are consistent with the existence of a high temperature SC-like
phase or fluctuations up to 650 K. It is proposed to expose such CA film to
energetic particle (neutron or ion) bombardment to verify this hypothesis. Such
bombardment would change both the structure of film and consequently the
experimental measurements. In addition such bombardment-induced changes will
provide a basis for particle detectors utilizing the Josephson effect.
