He intercalated C60 solid under high pressure

In situ synchrotron X-ray diffraction measurement of solid C60 under high pressure up to about 26 GPa was performed using He gas as pressure transmitting medium. This is the first study to precisely investigate the structural property of the He intercalated C60 under high pressure in a few tens GPa range. It was found that the He intercalated C60 solid is much less compressible than the pure C60 solid. The bulk modulus of the He intercalated C60 solid is determined to be B0 = 35.1 (6.0) GPa. The effect of hydrostaticity on the deformations of unit cell and C60 molecule is also discussed.