Abstract
THE discovery of conductivity1 in AxC60 (where A represents an alkali metal) and superconductivity2 in KxC60 has been followed by reports of superconductivity in other alkali-metal-doped full-erides with transition temperatures as high as 33 K (ref. 3). Elucidation of phase diagrams and understanding the relationship between structure and superconducting properties is essential to a detailed understanding of superconductivity in these systems. So far, structural data have been reported only for the non-conducting, intercalated body-centred cubic (b.c.c.) structures A6C60 (where A is K or Cs; ref. 4), a body-centred tetragonal structure for A6C60 (where A is K, Rb, Cs; ref. 5) and the superconducting, intercalated face-centred cubic (f.c.c.) material K3C60 (ref. 6). Here we report the preparation of a series of single-phase, isostructural f.c.c. superconductors with composition A3C60 (where A is K, Rb, Cs or a mixture of these), and show that Tcc increases monotonically with the size of the unit cell. Extended Hiickel band-structure calcula-tions also show a monotonic increase in the density of states at the Fermi level, N(EF), with lattice parameter. The primary impli-cation of these results is that all A3C60 superconductors have the same structure and that changes in Tc can be accounted for by changes in N(EF).
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References
Haddon, R. C. et al. Nature 350, 320–322 (1991).
Hebard, A. F. et al. Nature 350, 600–601 (1991).
Tanigaki, K. et al. Nature 352, 222–223 (1991).
Zhou, O. et al. Nature 351, 462–464 (1991).
Fleming, R. M. et al. Nature (this issue).
Stephens, P. W. et al. Nature 351, 632–634 (1991).
Williams, J. M. et al. Physica B135, 520 (1985).
Hinks, D. G. et al. Nature 333, 836–838 (1988).
Whangbo, M.-H., Kang, D. B. & Torardi, C. C. Physica C 158, 371–376 (1989).
Fischer, J. E. et al. Science 252, 1288–1290 (1991).
Duclos, S. J. et al. Nature 351, 380–382 (1991).
Schirber, J. E. et al. Physica C 178, 137–139 (1991).
Sparn, G. et al. Science 252, 1829–1831 (1991).
Rosseinsky, M. J. et al. Phys. Rev. Lett. 66, 2830–2832 (1991).
Haddon, R. C. et al. in Carbon Clusters (American Chemical Society, Washington DC, in the press).
Chadi, D. J. & Cohen, M. L. Phys. Rev. B 8, 5747–5753 (1973).
Whangbo, M.-H. et al. J. Am. chem. Soc. 109, 90–94 (1987).
Kelty, S. P., Chen, C.-C. & Lieber, C. M. Nature 352, 223–225 (1991).
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Fleming, R., Ramirez, A., Rosseinsky, M. et al. Relation of structure and superconducting transition temperatures in A3C60. Nature 352, 787–788 (1991). https://doi.org/10.1038/352787a0
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DOI: https://doi.org/10.1038/352787a0
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