C60 and C70 form with cubane (C8 H8) molecules rotor-stator phases in which the fullerenes are rotating and the cubanes are static. Heating the rotor-stator phase up to 470 K a fulleride copolymer, poly (C60 C8 H8), is obtained. Here, we study using microwave conductivity measurements, electron-spin resonance, and superconducting quantum interference device magnetometry the effect of potassium intercalation on the electric and magnetic properties of poly (C60 C8 H8). The resulting K2 C60 C8 H8 copolymer is metallic for T>200 K in contrast to the insulating pristine poly (C60 C8 H8) copolymer. At lower temperatures, a disorder-driven Anderson localization of the electrons takes place and the ground state is a magnetic insulator.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Aug 6 2009|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics