Superconducting Intercalated Fullerenes-Preparation Routes and Properties

Abstract Superconducting C60 powder samples are investigated by means of dc magnetization and X-ray diffraction. We discuss effects on the superconducting behaviour arising from different sample preparation and grain sizes. We derive then the temperature dependence of the magnetic penetration depth which agrees best with theoretical expressions for weak-coupled BCS-type superconductors in the clean limit.