Abstract
The high-pressure response of the Sm2.75C60 fulleride is probed by
Raman spectroscopy. The Raman spectrum of Sm2.75C60 and its pressure
evolution differ significantly from those of pristine C60. The initial
well-resolved Raman spectrum of the fulleride disappears above 4GPa.
This change is reversible; however, the original low-pressure Raman
profiles are recovered only below 2GPa. These observations are in line
with the pressure-induced hysteretic phase transition of the compound
observed earlier by X-ray diffraction and the proposed insulator to
metal transition.
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