Raman study of Cs3C60 under ambient pressure

Abstract Temperature dependence of Raman scattering in a pressure-induced superconductor Cs 3 C 60 was studied under ambient pressure between 2 and 290 K. The contributions of the intramolecular vibration modes to electron–phonon coupling were evaluated by comparing the linewidths of the modes in Cs 3 C 60 with those in pristine C 60 . The total electron–phonon coupling constant λ was ≈0.18, approximately one-third of the values for Rb 3 C 60 and K 3 C 60 . Temperature-dependent Raman scattering in the superconductor Rb 3 C 60 and a non-superconductor Rb 6 C 60 was also measured for comparison.