Room-temperature compressibility ofC60: Intercalation effects with He, Ne, and Ar

We report measurements to 6 kbar of the room-temperature compressibilities of ${\mathrm{C}}_{60}$ for both the fcc and sc phases using He, Ne, and Ar as pressure media. The effects of rare-gas intercalation on the fcc-to-sc transition and on the compressibilities are discussed and we compare our results with the widely disparate literature values reported for the fcc compressibility.