MICROWAVE CONDUCTIVITY OF THE SOFT FERROMAGNET (TDAE)-C60

(Tetrakisdimethylaminoethylene)-C60 was the first fullerene charge tra nsfer complex with a transition into a soft ferromagnetic low temperat ure phase at 16 K. The origin of the low temperature phase in (TDAE)-C 60 is still a subject of discussion. To unravel the real nature of the ferromagnetic ground state we will present measurements of the conduc tivity in (TDAE)-C60 for the first time. The conductivity is of the or der of 10(-4) S/cm at room temperature and the temperature dependence is clearly nonmetallic. This contradicts the assumption that (TDAE)-C6 0 is a ferromagnetic metal.