Abstract
RECENT reports1–3 of superconductivity in alkali-metal-doped compounds of the icosahedral C60 (buckminsterfullerene) molecule have attracted great experimental and theoretical interest. Superconductivity was originally discovered in samples prepared from gas–solid reactions1, which made it impossible to determine the composition or structure of the superconducting phase. Holczer et al.4 demonstrated that potassium-doped C60 has only a single stable superconducting phase, K3C60, with a transition temperature of 19.3 K. Improvements have since resulted in the preparation of 100% bulk superconductors3. Because of the absence of impurity phases, we have been able to perform accurate Rietveld analysis of X-ray diffraction data from the superconducting phase. Here we report our results for the crystal structure of K3C60, determining that this superconducting compound has a face-centred cubic structure with a well defined stoichiometry. These results should open the way to rigorous description of the normal and superconducting properties of this compound.
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Stephens, P., Mihaly, L., Lee, P. et al. Structure of single-phase superconducting K3C60. Nature 351, 632–634 (1991). https://doi.org/10.1038/351632a0
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DOI: https://doi.org/10.1038/351632a0
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