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Superconductivity at 33 K in CsxRbyC60

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Abstract

THE synthesis of macroscopic quantities1,2 of the fullerenes C60 and C70 has led to discoveries of several unusual properties3–10, in particular the high conductivity3 and superconductivity4–6 of alkali-metal-doped phases. Here we report a superconducting phase of C60 doped with caesium and rubidium, which has the highest transition temperature Tc and the largest diamagnetic shielding found so far for the alkali-metal-doped compounds. CSxRbyC60 (x = 2 and y = 1 in the dopant feed) exhibits a Tc of 33 K and a diamagnetic shielding of over 60%. This is also the highest Tc yet observed in a molecular superconductor. The vari-ation of Tc with dopant, Tc (KxC60) [18 K]< Tc (RbxC60) [∼29 K]< Tc (CsxRbyC60) [33 K], supports the interpretation that the transi-tion temperature of these fullerides is determined mainly by the density of states at the Fermi level.

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Authors and Affiliations

  1. Fundamental Research Laboratories, NEC Corporation, Tsukuba, 305, Japan

    K. Tanigaki, T. W. Ebbesen, S. Saito, J. Mizuki, J. S. Tsai, Y. Kubo & S. Kuroshima

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  1. K. Tanigaki
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  2. T. W. Ebbesen
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  3. S. Saito
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  4. J. Mizuki
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  5. J. S. Tsai
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  6. Y. Kubo
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  7. S. Kuroshima
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Tanigaki, K., Ebbesen, T., Saito, S. et al. Superconductivity at 33 K in CsxRbyC60. Nature 352, 222–223 (1991). https://doi.org/10.1038/352222a0

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  • DOI: https://doi.org/10.1038/352222a0

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