13C NMR and ESR studies of the KBaCsC60 fulleride

In this work, we present NMR and electron spin resonance (ESR) data on KBaCsC60 fulleride. The obtained 13C MAS NMR (MAS: magic angle spinning) spectrum shows two resonances, an intense and sharp line at 188 ppm and a weak and small peak at 180 ppm. We attribute the first one to the KBaCsC60, which is the dominant phase, and the last one to residual AC60 (A=K or Cs) phase present in the sample. The ESR results reveal a metallic behaviour of the studied compound, in contrast to the insulating A4C60 (A=K, Rb, Cs) fullerides.