In-Situ Infrared Transmission Study of Rb- and K-Doped Fullerenes

Details In-Situ Infrared Transmission Study of Rb- and K-Doped Fullerenes In-Situ Infrared Transmission Study of Rb- and K-Doped Fullerenes

1993-03-09

arxiv.org/abs/cond-mat/9303016v1

Phys. Rev. B 47, 14607 (1993)

Physics

Condensed Matter

3 pages, Figure 1 included, 3 more figures available by request. REVTEX v3.0 IRC60DOP

Scientific paper

10.1103/PhysRevB.47.14607

We have measured the four IR active $C_{60}$ molecular vibrations in $M_{x}C_{60}$ $(M = K, Rb)$ as a function of doping $x$. We observe discontinuous changes in the vibrational spectra showing four distinct phases (presumably $x = 0, 3, 4$, and 6). The $1427cm^{-1}$ and $576cm^{-1}$ modes show the largest changes shifting downward in frequency in four steps as the doping increases. Several new very weak modes are visible in the $x=6$ phase and are possibly Raman modes becoming weakly optically active. We present quantitative fits of the data and calculate the electron-phonon coupling of the $1427cm^{-1}$ IR mode.

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