Pressure dependence of phonons in Rb4C60 studied with Raman spectroscopy

Ch. Bellin (1) , J. C. Chervin (1) , C. Hérold (2) , Nedjma Bendiab (3, 1)

1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 LCSM - Laboratoire de chimie du solide minéral
3 LSP - Laboratoire de Spectrométrie Physique

Raman spectra of Rb4C60 have been measured as a function of pressure up to 8 GPa at room temperature. Intramolecular modes exhibit three remarkable changes around 0.6, 1.7, and 4 GPa. An increase in the pressure slopes of various mode frequencies occurs at 0.6 GPa. Then an overall decrease in the pressure slopes occurs around 1.7 GPa. Finally, we observe the new lines appearing around 4 GPa. These effects are discussed in terms of reduction in the symmetry of the C60 molecule and electron hopping.

Domaines: Physique Quantique [quant-ph]

Ch. Bellin, J. C. Chervin, C. Hérold, Nedjma Bendiab. Pressure dependence of phonons in Rb4C60 studied with Raman spectroscopy. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2008, 77, pp.245409. ⟨10.1103/PhysRevB.77.245409⟩. ⟨hal-00325989⟩