Raman scattering in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">C</mi></mrow><mrow><mn>60</mn></mrow></msub></mrow></math></span> and alkali-metal-doped <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">C</mi></mrow><mrow><mn>60</mn></mrow></msub></mrow></math></span> films

Kai-An Wang; Ying Wang; Ping Zhou; J. M. Holden; Song-lin Ren; G. T. Hager; H. F. Ni; P. C. Eklund; G. Dresselhaus; M. S. Dresselhaus

doi:10.1103/PhysRevB.45.1955

Rapid Communication

Raman scattering in $C_{60}$ and alkali-metal-doped $C_{60}$ films

Kai-An Wang, Ying Wang, Ping Zhou, J. M. Holden, Song-lin Ren, G. T. Hager, H. F. Ni, P. C. Eklund, G. Dresselhaus, and M. S. Dresselhaus

Phys. Rev. B 45, 1955(R) – Published 15 January 1992

Abstract

The Raman-active modes of solid films of $C_{60}$ and $M_{X}$ $C_{60}$ (x∼6; M=K, Rb, Cs) have been studied experimentally. The mode activity is dominated by intraball interactions, and the effect of the $M^{+}$ ions on the $C_{60}$ spectrum is observed to be almost insensitive to the radius or mass of the alkali metal. Tangential modes of solid $C_{60}$ are observed to soften in $M_{6}$ $C_{60}$ 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.

Received 14 October 1991

DOI:https://doi.org/10.1103/PhysRevB.45.1955

Authors & Affiliations

Kai-An Wang and Ying Wang

Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40511

Ping Zhou

Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511

J. M. Holden and Song-lin Ren

Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky, 40506

G. T. Hager and H. F. Ni

Center of Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511

P. C. Eklund

Department of Physics and Astronomy and Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506

G. Dresselhaus

Francis Bitter National Magnetic Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

M. S. Dresselhaus

Department of Electrical Engineering and Computer Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

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Vol. 45, Iss. 4 — 15 January 1992

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