Electron-phonon interaction in C-70

[摘要] The matrix elements of the deformation potential of C-70 are calculated by means of a simple, yet accurate solution of the electron-phonon coupling problem in fullerenes, based on a parametrization of the ground-state electronic density of the system in terms of sp(2+x) hybridized orbitals. The value of the calculated dimensionless total electron-phonon coupling constant is lambda approximate to 0.1, an order of magnitude smaller than in C-60, consistent with the lack of a superconducting phase transition in C(70)A(3) fullerite, and in overall agreement with measurements of the broadening of Raman peaks in C70K4 We also calculate the photoemission cross section of C-70(-) which is found to display less structure than that associated with C-60(-), in overall agreement with the experimental findings.

[关键词] SUPERCONDUCTIVITY;C-60;FULLERENES;VIBRATIONS;CARBON;KXC70