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Superconductivity at 18 K in potassium-doped C60

Naturevolume 350pages600601 (1991) | Download Citation

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Abstract

THE synthesis of macroscopic amounts of C60 and C70 (fullerenes)1 has stimulated a variety of studies on their chemical and physical properties2,3. We recently demonstrated that C60 and C70 become conductive when doped with alkali metals4. Here we describe low-temperature studies of potassium-doped C60 both as films and bulk samples, and demonstrate that this material becomes superconducting. Superconductivity is demonstrated by microwave, resistivity and Meissner-effect measurements. Both polycrystalline powders and thin-film samples were studied. A thin film showed a resistance transition with an onset temperature of 16 K and essentially zero resistance near 5 K. Bulk samples showed a well-defined Meissner effect and magnetic-field-dependent microwave absorption beginning at 18 K. The onset of superconductivity at 18 K is the highest yet observed for a molecular superconductor.

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Affiliations

  1. AT&T Bell Laboratories, Murray Hill, New Jersey, 07974-2070, USA

    • A. F. Hebard
    • , M. J. Rosseinsky
    • , R. C. Haddon
    • , D. W. Murphy
    • , S. H. Glarum
    • , T. T. M. Palstra
    • , A. P. Ramirez
    •  & A. R. Kortan

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https://doi.org/10.1038/350600a0

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