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Raman Scattering in MxC60 Films (M=K. Rb, Cs; ×=0, 3.6)

Published online by Cambridge University Press:  25 February 2011

Kai-An Wang ,
Ping Zhou ,
Ying Wang ,
J. M. Holden ,
Song-Mn Ren ,
G. T. Hager ,
H. F. Ni ,
P. C. Eklund ,
G. Dresselhaus  and
M. S. Dresselhaus
Kai-An Wang
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
Ping Zhou
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506
Ying Wang
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
J. M. Holden
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
Song-Mn Ren
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
G. T. Hager
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506
H. F. Ni
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506
P. C. Eklund
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506
G. Dresselhaus
Affiliation:
Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
M. S. Dresselhaus
Affiliation:
Department of Electrical Engineering and Computer Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Abstract

The Raman-active modes of solid films of MxC60 (x-0, 6; M=K, Rb, Cs) and K3C60 have been studied experimentally. The mode-activity is dominated by intraball interactions, and the effect of the M + ions on the C60 spectrum is observed to be almost insensitive to the radius or mass of the alkali metal. Tangential modes of solid C60 are observed to soften in M660 by -60 cm−1, which can be attributed to a charge-transfer-induced elongation of the intraball bond lengths, similar to that observed in graphite intercalation compounds. Conversely, the radial modes are found to upshift slightly, indicating that a competing mechanism counteracts the effect of the bond elongation. For K3C60, six Raman lines have been observed in which the lowest frequency mode exhibits a Breit-Wigner-Fano lineshape, indicating a coupling between the lowest frequency Hq-derived intramolecular modes of C60 and a broad Raman-active continuum with the same symmetry lying lower in frequency.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 373
Copyright
Copyright © Materials Research Society 1992

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References

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