TEMPERATURE-DEPENDENCE OF THE RAMAN-SPECTRUM IN C60 DOPED WITH ALKALI-METALS

We report on Raman-scattering results of a well characterized K3C60 sa mple and of Rb(x)C60 and Cs(x)C60 samples. In these three compounds th e position of the A(g) pinch mode at room-temperature is measured at a round 1448 cm-1. This last position of the A(g) pinch mode is known as the Raman signature of a A3C60 phase. This result raises the question of the ability to obtain a Cs3C60 phase by direct action of Cs vapor on C60. On the other hand, the temperature dependence of the Raman spe ctra of the studied A(x)C60 samples is reported and a special attentio n is given on the temperature dependence of the shift and width of the Raman A(g) pinch mode.