Important role of intermolecular vibrational modes in the superconductivity in alkali-metal-doped fullerenes

Various experiments support a view that the superconductivity in alkali-metal-doped fullerenes is a conventional one in the strong-coupling regime. From the simple Eliashberg analysis, we indicate that the strong-coupling of electrons with “intermolecular” modes is indispensable to explain both of t...

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Bibliographic Details
Published in:Solid state communications 1993-06, Vol.86 (10), p.627-632
Main Authors: Yoshiko Oi Nakamura, Yokoya, Yasushi, Matsuda, Naoya, Shiina, Yasushi
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Superconductivity
Theories and models of superconducting state
Theory and models of superconducting state
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Summary:Various experiments support a view that the superconductivity in alkali-metal-doped fullerenes is a conventional one in the strong-coupling regime. From the simple Eliashberg analysis, we indicate that the strong-coupling of electrons with “intermolecular” modes is indispensable to explain both of their superconducting transition temperature and gap measured in tunneling experiments simultaneously. It is also speculated that the relatively week coupling of electrons with low-lying “intramolecular” radial modes is possible to play an additional role to this main coupling with “intermolecular” modes. The calculated NMR ratio ( 1 T 1 ) s ( 1 T 1 ) n from our gap functions Δ(ω, T) solved with these models, explains well the NMR result that no coherence peak has been observed in these materials.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(93)90828-B