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Science 8 November 1991:
Vol. 254. no. 5033, pp. 842 - 845
DOI: 10.1126/science.254.5033.842
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Articles

Theoretical Fermi-Surface Properties and Superconducting Parameters for K3C60

STEVEN C. ERWIN 1 and WARREN E. PICKETT 2

1 Department of Physics, University of Pennsylvania, Philadelphia, PA 19104-6272
2 Complex Systems Theory Branch, Code 4692, Naval Research Laboratory, Washington, DC 20375-5000

Quantitative theories of superconductivity in alkali-doped C60 require an accurate and detailed description of the Fermi surface. First-principles calculations of Fermi-surface properties and electronic parameters for K3C60, 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 Lgr = 1600 Å. Comparing the Fermi velocity with the experimental coherence length leads to a superconducting pairing strength lgr sim 5, indicating very strong coupling. Partial nesting in the second Fermi-surface sheet may favor coupling to short-wavelength q,0,0 optic modes.

Submitted on September 9, 1991
Accepted on September 26, 1991


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Band Structure and Fermi Surface of Electron-Doped C60 Monolayers.
W. L. Yang, V. Brouet, X. J. Zhou, H. J. Choi, S. G. Louie, M. L. Cohen, S. A. Kellar, P. V. Bogdanov, A. Lanzara, A. Goldoni, et al. (2003)
Science 300, 303-307
   Abstract »    Full Text »    PDF »
Compressibility of M3C60 Fullerene Superconductors: Relation Between Tc and Lattice Parameter.
O. ZHOU, Q. ZHU, J. E. FISCHER, N. COUSTEL, G. B. M. VAUGHAN, P. A. HEINEY, J. P. MCCAULEY JR., and A. B. SMITH III (1992)
Science 255, 833-835
   Abstract »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)