Heterometallic fullerides of Fe and Cu groups with the composition K2MC60 (M=Fe+2, Fe+3, Co+2, Ni+2, Cu+1, Cu+2, Ag+1) Original Research Article

Heterometallic fullerides with composition K2MC60, synthesized by exchange chemical reaction of K5C60 or K4C60 with chlorides of metals Fe and Cu groups have been investigated by X-ray diffraction, magnetic resonance, Raman and Mössbauer spectroscopy. Magnetization and susceptibility measurements have also been carried out. Metal chlorides from Fe and Cu groups enable to cover the whole range of electronic configuration of metal from d5 to d10. Heterometallic fullerides with M=Cu+2, Fe+2, Fe+3 and Ni+2 appeared to be superconductors with Tc=13.9–16.5 K. Ferromagnetism and superconductivity coexist in investigated fulleride K2Fe+3C60.