Variations of electron-phonon coupling in alkali-metal--C sub 60 solid solutions
- Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
We report on {ital in} {ital situ}, interference-enhanced Raman-scattering studies of ultrathin, several monolayer thick films that demonstrate solid-solution formation of {ital A}{sub {ital x}}C{sub 60} for {ital A}=NA, K, Rb, Cs and {ital x}{le}3. In contrast to Na{sub {ital x}}C{sub 60}, which indicates moderate, disorder-related vibrational broadening, the other alkali-metal--fulleride Raman spectra exhibit larger changes in intramolecular C{sub 60} derived Hg(2) and Hg(8) modes due to substantial electron-phonon coupling. These observations are consistent with the absence of superconductivity in Na{sub {ital x}}C{sub 60} and comparable, substantial electron-phonon coupling in K{sub {ital x}}C{sub 60} and Rb{sub {ital x}}C{sub 60}. For Cs{sub {ital x}}C{sub 60}, the largest electron-phonon coupling for Hg(2) is observed for {ital x}{congruent}1, in contrast to values of {ital x}{congruent}2 for K and Rb doped materials.
- DOE Contract Number:
- FG02-84ER45095
- OSTI ID:
- 7292275
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:6; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360606* -- Other Materials-- Physical Properties-- (1992-)
ALKALI METAL COMPOUNDS
ALLOYS
CARBON
CESIUM ADDITIONS
CESIUM ALLOYS
COUPLING
DISPERSIONS
ELECTRON-PHONON COUPLING
ELEMENTS
FILMS
FULLERENES
MIXTURES
NONMETALS
POTASSIUM ADDITIONS
POTASSIUM ALLOYS
RAMAN SPECTRA
RUBIDIUM ADDITIONS
RUBIDIUM ALLOYS
SODIUM ADDITIONS
SODIUM ALLOYS
SOLID SOLUTIONS
SOLUTIONS
SPECTRA
THIN FILMS