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APS » Journals » Phys. Rev. Lett. » Volume 83 » Issue 11
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Phys. Rev. Lett. 83, 2258–2261 (1999)

Structural and Electronic Properties of the Noncubic Superconducting Fullerides A4′C60 (A′ = Ba,Sr)

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Craig M. Brown1,2, Susumu Taga3, Balvinder Gogia4, Konstantinos Kordatos1, Serena Margadonna1, Kosmas Prassides1, Yoshihiro Iwasa3, Katsumi Tanigaki5, Andrew N. Fitch6, and Philip Pattison7
1School of Chemistry, Physics and Environmental Science, University of Sussex, Brighton, BN1 9QJ, United Kingdom
2Institut Laue Langevin, B.P. 156, F-38042 Grenoble, France
3Japan Advanced Institute of Science and Technology, Tatsunokuchi, Ishikawa 923-1292, Japan
4Department of Advanced Chemical Technology, National Institute of Materials and Chemical Technology, 1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
5Faculty of Science, Osaka-city University, PREST, JST. 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
6European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble, France
7Institute of Crystallography, University of Lausanne, CH-1015 Lausanne, Switzerland

Received 23 April 1999; published in the issue dated 13 September 1999

The absence of superconductivity in noncubic alkali fullerides, A4C60 (A = K,Rb,Cs) has been associated with the effects of electron correlation and electron-phonon interaction on the narrow t1u-derived conduction band. We find that the structurally related alkaline earth fullerides, A4′C60 (A′ = Sr,Ba), are superconducting with small values of the densities of states at the Fermi level, NεF. Close contacts between Ba2+ ions and neighboring C60 units in Ba4C60 imply a strong orbital hybridization, which is evidently responsible for stabilizing the noncubic superconducting phase, in contrast to insulating A4C60.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.2258
DOI:
10.1103/PhysRevLett.83.2258
PACS:
74.70.Wz, 61.10.Nz, 61.48.+c
 
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