O. Zhou, G. B. M. Vaughan, Q. Zhu, J. E. Fischer, P. A. Heiney, N. Coustel, J. P. McCauley, Jr., and A. B. Smith, III, Science 255, 833-835 (1992).
We used x-ray diffraction and diamond anvil techniques to measure the isothermal compressibility of K3C60 and Rb3C60, the superconducting binary alkali metal intercalation compounds of solid buckminsterfullerene. Combined with previous measurements by other groups, we establish a universal first-order relationship between superconducting onset temprature Tc and lattice constant a over a broad range, 13.9 Angstrom < a < 14.5 Angstrom. We also observe a small second-order intercalate-specific effect which allows us to rule out the participation of intercalate-fullerene optic modes in the pairing interaction.
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