ANOMALIES IN THE MICROWAVE CONDUCTIVITY OF A POLYCRYSTALLINE C-60 MEMBRANE

A study is reported of an anomaly in che microwave conductivity of a p olycrystalline C-60 membrane at T-c=260 K (the transition width is 30 K). Raman scattering measurements indicate that the sample is the C-60 fullerite without any signs of graphitization, amorphous phase, or th e presence of C-70 and that the detected microwave conductivity jump c an be unambiguously identified as due to the C-60 phase. (C) 1998 Amer ican Institute of Physics. [S1063-7834(98)04003-9].