Abstract
We report on Raman-scattering results of a well characterized K 3C 60 sample and of Rb xC 60 and Cs xC 60 samples. In these three compounds the position of the A g pinch mode at room-temperature is measured at around 1448 cm -1. This last position of the A g pinch mode is known as the Raman signature of a A 3C 60 phase. This result raises the question of the ability to obtain a Cs 3C 60 phase by direct action of Cs vapor on C 60. On the other hand, the temperature dependence of the Raman spectra of the studied A xC 60 samples is reported and a special attention is given on the temperature dependence of the shift and width of the Raman A g pinch mode.
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