MAGNETIC AND ELECTRICAL BEHAVIORS OF C-60(TDAE) SINGLE-CRYSTAL

Significant size of single crystals of C-60(TDAE), where TDAE is tetrakis(dimethylamino)ethylene, have been prepared from a toluene solution for the first time by a diffusion method. The resulting conglomerate of black colored needles is found to consist of single crystals by X-ray diffraction analysis. A resistivity of 1.1 x 10(5) Omega cm at room temperature and an activation energy of 0.4 similar to 0.8 eV suggest that an obtained C,(TDAE) crystal is not metallic but semiconducting. The crystals do not show a ferromagnetic behavior but Pauli- and Curie-Weiss paramagnetism with a negative Weiss constant, theta = -0.44 K. It was found that the difference in the magnetic properties between crystal and powder samples may originate from the change of the lattice constants.