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.
Electron-phonon interaction in C-70 / D. Provasi, N. Breda, R. Broglia, G. Colo, H. Roman, G. Onida. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 61:11(2000), pp. 7775-7780.
Electron-phonon interaction in C-70
G. Colo;G. OnidaUltimo
2000
Abstract
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.Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.