Electron-phonon interaction in the solid form of the smallest fullerene
Dipartimento di Scienza dei Materiali and Istituto
Nazionale di Fisica per la Materia Università di
Milano-Bicocca - Via Cozzi 53, I-20125, Milano, Italy
Accepted: 21 May 2002
The electron-phonon coupling of a theoretically devised carbon phase made by assembling the smallest fullerenes is calculated from first principles. The structure consists of cages in a fcc lattice interlinked by two bridging carbon atoms in the interstitial tetrahedral sites (fcc-). The crystal is insulating but can be made metallic by doping with interstitial alkali atoms. In the compound the calculated coupling constant is 0.28, a value much larger than in , as expected from the larger curvature of . On the basis of McMillan's formula, the calculated and a assumed in the range 0.3–0.1, a superconducting in the range 15–55 is predicted.
PACS: 71.15.Mb – Density functional theory, local density approximation, gradient and other corrections / 74.70.Wz – Fullerenes and related materials / 74.10.+v – Superconductivity: Occurrence, potential candidates
© EDP Sciences, 2002