Determination of the superconducting energy gap of Rb 3C 60 by electronic Raman scattering

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 indicat...

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Bibliographic Details
Published inPhysica. C, Superconductivity Vol. 307; no. 1; pp. 79 - 86
Main Authors Els, G, Lemmens, P, van Loosdrecht, P.H.M, Güntherodt, G, Lang, H.P, Thommen-Geiser, V, Güntherodt, H.-J
Format Journal Article
LanguageEnglish
Published Elsevier B.V 1998
Subjects
Energy gap
Fullerides
Raman scattering
Superconductivity
78.30.-j
74.25.Gz
Energy gap
Raman scattering
74.70.Wz
Superconductivity
Fullerides
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Summary: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.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(98)00417-1