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Neutron Spectroscopy of Superconducting Fullerides

Published online by Cambridge University Press:  25 February 2011

Kosmas Prassides ,
Christos Christides ,
John Tomkinson ,
Matthew J. Rosseinsky ,
D. W. Murphy  and
Robert C. Haddon
Kosmas Prassides
Affiliation:
School of Chemistry and Molecular Sciences, University of Sussex, Brighton BN1 9QJ, UK
Christos Christides
Affiliation:
School of Chemistry and Molecular Sciences, University of Sussex, Brighton BN1 9QJ, UK
John Tomkinson
Affiliation:
Rutherford Appleton Laboratory, Didcot, Oxon OX1 1 0QX, UK
Matthew J. Rosseinsky
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
D. W. Murphy
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
Robert C. Haddon
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
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Abstract

The phonon spectra of pristine fullerene, superconducting K3C60 and saturation-doped Rb6C60 measured by inelastic neutron scatteringin the energy range 2.5 - 200 meV at low temperatures reveal substantial broadening of five-fold degenerate Hg intramolecular vibrational modes both in the low-energy radial and the high-energy tangential part of the spectrum. This provides strong evidence for a traditional phonon-mediated mechanism of superconductivity in the fullerides but with an electron-phonon coupling strength distributed over a wide range of energies (33-195 meV) as a result of the finite curvature of the fullerene spherical cage.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 270: Symposium M – Novel Forms of Carbon , 1992 , 185
Copyright
Copyright © Materials Research Society 1992

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References

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