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Phys. Rev. B 59, R6628–R6630 (1999)

Superconductivity in LixCsC60 fullerides

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Mayumi Kosaka
Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba 305-8501, Japan

Katsumi Tanigaki
Department of Material Science, Faculty of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan

Kosmas Prassides, Serena Margadonna, Alexandros Lappas, and Craig M. Brown
School of Chemistry, Physics and Environmental Science, University of Sussex, Brighton BN1 9QJ, United Kingdom

Andrew N. Fitch
European Synchrotron Radiation Facility, F-38043 Grenoble, France

Received 24 September 1998; published in the issue dated 1 March 1999

Superconductivity lost in Li2CsC60 is recovered when the t1u band is further filled through introduction of additional Li. Superconducting transition temperatures, Tc of 10.5 K and 8 K are observed for Li3CsC60 and Li4CsC60, respectively. The band filling of nonsuperconducting Li2CsC60 is established by Raman spectroscopy to be n=2.5, while that for superconducting Li3CsC60 is around n=3. These results indicate that appearance of superconductivity in alkali fullerides with stoichiometry A3C60 is sensitively controlled by the filling of the t1u band and that n=3 plays an especially important role.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.59.R6628
DOI:
10.1103/PhysRevB.59.R6628
PACS:
74.70.Wz, 61.48.+c, 71.20.Tx
 
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