New orientationally ordered low-temperature superstructure in high-purityC60

Abstract

Evidence is provided for a new low-temperature superstructure in pure ${\mathrm{C}}_{60}$; its structure can be described as face-centered cubic with a lattice parameter 2${\mathit{a}}_0$. The superstructure is most probably the result of rotations alternatingly over +${\mathit{\phi }}_1$ and -${\mathit{\phi }}_2$ about one of the 〈111〉 axes of neighboring molecules along the cube directions. The experimental evidence is based on low-temperature electron diffraction.