Theoretical Fermi-Surface Properties and Superconducting Parameters for K 3 C 60
Authors:
- 8 November 1991
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 254 (5033) , 842-845
Abstract
Quantitative theories of superconductivity in alkali-doped C 60 require an accurate and detailed description of the Fermi surface. First-principles calculations of Fermi-surface properties and electronic parameters for K 3 C 60 , the prototype fulleride-superconductor, are reported. The Fermi surface has two sheets; the first is free-electron-like, and the second is multiply-connected, forming two interlocked symmetry-equivalent pieces that never touch. The calculated (clean limit) London penetration depth is λ = 1600 Å. Comparing the Fermi velocity with the experimental coherence length leads to a superconducting pairing strength λ ∼ 5, indicating very strong coupling. Partial nesting in the second Fermi-surface sheet may favor coupling to short-wavelength 〈 q ,0,0〉 optic modes.Keywords
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