  Since the initial report of the potential occurrence of room-temperature
superconductivity under normal pressure [arXiv: 2307.12008], there has been
significant interest in the field of condensed matter physics regarding
Cu-doped Apatite (Pb10-xCux(PO4)6O). In this study, we performed
temperature-dependent resistivity measurements on the synthesized
Pb10-xCux(PO4)6O samples. The structure of the sample was confirmed to match
the reference literature through X-ray diffraction analysis. Remarkably, we
observed four distinct types of resistivity behaviors within samples from the
same pellet: (1) A semiconductor-like behavior characterized by a decrease in
resistivity as the temperature is lowered. (2) A gradual reduction in
resistivity, reaching an exceptionally small value that falls below the
resolution limits of our measurement equipment. (3) An abrupt drop in
resistivity to a low value at ~ 250 K. (4) An almost linear reduction in
resistivity exhibiting a transition at approximately 7 K (possibly associated
with Pb). Following a thorough compositional analysis, we proposed a current
percolation model, based on the formation of a Cu/Pb current channel, to
elucidate the observed special resistivity behaviors. It is important to note
that the Meissner effect was not observed in our magnetization measurements.
Consequently, we reached the conclusion that the presence of superconductivity
in Cu-doped Apatite has yet to be substantiated.
