Possible competition of superconductivity and ferromagnetism in CexC60 compounds

Abstract Solid-phase reaction of cerium and C 60 powders under 600 °C may yield unusual magnetic materials which involve fairly strong dia- and ferro-magnetism at almost similar low temperature range, below 13.5 K. The temperature dependence of the electrical resistivity of this material may indicate that the diamagnetism is due to the superconductivity and there are possible interplays between the superconductivity and the ferromagnetism in this material.