The electron-phonon coupling of a theoretically devised carbon phase made by assembling the smallest fullerenes C-20 is calculated from first principles. The structure consists of C-20 cages in a fcc lattice interlinked by two bridging carbon atoms in the interstitial tetrahedral sites (fcc-C-22). The crystal is insulating but can be made metallic by doping with interstitial alkali atoms. In the compound NaC22 the calculated coupling constant lambda/N(0) is 0.28 eV, a value much larger than in C-60, as expected from the larger curvature of C-20. On the basis of McMillan's formula, the calculated lambda = 1.12 and a mu* assumed in the range 0.3-0.1, a superconducting T-c in the range 15-55 K is predicted

Spagnolatti, I., Bernasconi, M., Benedek, G. (2002). Electron-phonon interaction in the solid form of the smallest fullerene C-20. EUROPHYSICS LETTERS, 59(4), 572-578 [10.1209/epl/i2002-00384-1].

Electron-phonon interaction in the solid form of the smallest fullerene C-20

Bernasconi, M;Benedek, G.
2002

Abstract

The electron-phonon coupling of a theoretically devised carbon phase made by assembling the smallest fullerenes C-20 is calculated from first principles. The structure consists of C-20 cages in a fcc lattice interlinked by two bridging carbon atoms in the interstitial tetrahedral sites (fcc-C-22). The crystal is insulating but can be made metallic by doping with interstitial alkali atoms. In the compound NaC22 the calculated coupling constant lambda/N(0) is 0.28 eV, a value much larger than in C-60, as expected from the larger curvature of C-20. On the basis of McMillan's formula, the calculated lambda = 1.12 and a mu* assumed in the range 0.3-0.1, a superconducting T-c in the range 15-55 K is predicted
Articolo in rivista - Articolo scientifico
fullerene, superconduttivita'
English
2002
59
4
572
578
none
Spagnolatti, I., Bernasconi, M., Benedek, G. (2002). Electron-phonon interaction in the solid form of the smallest fullerene C-20. EUROPHYSICS LETTERS, 59(4), 572-578 [10.1209/epl/i2002-00384-1].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/23432
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