Raman scattering and electron phonon coupling in A3C60

被引:23
作者
Mitch, Michael G.
Lannin, Jeffrey S.
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10.1016/0022-3697(93)90293-Z
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摘要
Raman scattering measurements performed in situ in UHV on thin and ultrathin films of doped C60 are reported for variations in alkali-metal type, composition and temperature. The results emphasize the important role of disorder on Raman processes and the probing of electron-phonon coupling relevant to superconductivity. Detailed comparisons of free carrier phonon damping effects on selected radial and tangential intramolecular phonons are discussed in Rb3C60 and K3C60 using nonmetallic Na3C60 as a reference. Elevated temperature studies of Na3C60 suggest a transition to a more metallic state. Intermolecular Raman scattering associated with alkali-metal motion, weakly coupled to C60 clusters is reported. The effects of alkali size, lattice thermal expansion and disorder are discussed.
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页码:1801 / 1816
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