Mj. Rice et al., BROADENING AND ANOMALOUS INFRARED ACTIVITY OF THE H-G-DERIVED PHONONSIN THE METALLIC FULLERIDES, Physical review. B, Condensed matter, 49(5), 1994, pp. 3687-3690
It is pointed out that broadening of the Raman-active H-g-derived phon
ons in the fulleride superconductors is due to interband electron-phon
on interaction and that orientational disorder can render these phonon
s infrared active. The long-wavelength A(g) phonons are left completel
y unrenormalized by the electron-phonon interaction.