High pressure stability of Cs6C60

Roberta Poloni (1, 2, 3) , Denis Machon (1) , Marivi Fernandez-Serra (4) , Sylvie Le Floch (1) , Sakura Pascarelli (2) , Gilles Montagnac (5) , Hervé Cardon (5) , Alfonso San Miguel (1)

1 LPMCN - Laboratoire de Physique de la Matière Condensée et Nanostructures
2 ESRF - European Synchrotron Radiation Facility
3 ICMAB - Institut de Ciència de Materials de Barcelona
4 CECAM - Centre Européen de Calcul Atomique et Moléculaire
5 LST - Laboratoire de Sciences de la Terre

The Cs6C60 molecular crystal has been studied by Raman spectroscopy measurements and ab initio calculations under high pressure. The Raman scattering data have been collected from ambient pressure up to 45.5GPa at room temperature. It is shown that the intercalation of cesium atoms in the C60 crystalline structure allows us to preserve the C60 molecules up to the maximum studied pressure, i.e., more than twice the amorphization pressure of the solid C60 fullerene crystal. The calculated pressure evolution of all the observed Raman mode frequencies is in good agreement with that obtained experimentally. In this work, the high-resolution measurements allow us to observe six Raman modes and several partners in doublets in addition to the Raman lines previously observed for the same system. The symmetry of all the observed modes has been identified through our calculations.

Domains: Earth Sciences

Roberta Poloni, Denis Machon, Marivi Fernandez-Serra, Sylvie Le Floch, Sakura Pascarelli, et al.. High pressure stability of Cs6C60. Physical Review B, 2008, 77 (12), pp.125413. ⟨10.1103/PhysRevB.77.125413⟩. ⟨hal-00340987⟩