A comparative study of crystalline graphite and copper-doped fullerite memb
ranes is reported. It is assumed that C-60 clusters form complexes with oxy
gen and copper similar to those known to exist in graphite. Above room temp
erature, these complexes, first, change the symmetry of the fullerite latti
ce and, second, are responsible for the nonmonotonic temperature dependence
of the electrical resistance. (C) 1999 American Institute of Physics. [S10
63-7834(99)03804-6].