Abstract
Rb 3C 60 single crystals ( T c=31±0.5 K) have been investigated by Raman spectroscopy as a function of temperature with respect to phonon and electronic scattering. One of the intermolecular Rb−C 60 phonons observed showed changes upon cooling below the superconducting transition temperature indicating a strong coupling to the electronic system. Special attention was given to the electronic Raman scattering cross section of Rb 3C 60. A clear reduction of the scattering intensity for low frequencies has been observed below T c. This reduction is identified as the opening of the superconducting energy gap for which we find 2 Δ/ k B T c=4.0±0.5. This value was observed for several different scattering symmetries, in agreement with the proposed s-wave superconducting order parameter.
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