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Science 13 December 1991:
Vol. 254. no. 5038, pp. 1625 - 1627
DOI: 10.1126/science.254.5038.1625
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Articles

Raman Studies of Alkali-Metal Doped AxC60 Films (A = Na, K, Rb, and Cs; x = 0, 3, and 6)

S. J. DUCLOS 1, R. C. HADDON 1, S. GLARUM 1, and A. F. HEBARD 1

1 AT&T Bell Laboratories, Murray Hill, New Jersey 07974

The room temperature Raman spectra of the intramolecular modes between 100 cm–1 and 2000 cm–1 are reported for alkali-metal doped AxC60 films. For A = K, Rb, and Cs, phase separation is observed with the spectra of C60, K3C60, K6C60, Rb3C60, Rb6C60, and Cs6C60 phases reported. The x = 3 phases show only three Raman active modes: two of Ag symmetry and only the lowest frequency Hg mode. The other Hg modes regain intensity in the x = 6 films, with several mode splittings observed. For A = Na, such phase separation is not clearly observed, and reduced mode shifts are interpreted as due to incomplete charge transfer in these films.

Submitted on October 2, 1991
Accepted on October 29, 1991


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Electrical Resistivity and Stoichiometry of CaxC60 and SrxC60 Films.
R. C. Haddon, G. P. Kochanski, A. F. Hebard, A. T. Fiory, and R. C. Morris (1992)
Science 258, 1636-1638
   Abstract »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)