Compressibility of M3C60 fullerene superconductors : relation between Tc and lattice parameter

X-ray diffraction and diamond anvil techniques were used to measure the isothermal compressibility of K(3)C(60) and Rb(3)C(60), the superconducting, binary alkali-metal intercalation compounds of solid buckminsterfullerene. These results, combined with the pressure dependence of the superconducting...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1992-02, Vol.255 (5046), p.833-835
Main Authors: ZHOU, O, VAUGHAN, G. B. M, ZHU, Q, FISCHER, J. E, HEINEY, P. A, COUSTEL, N, MCCAULEY, J. P, SMITH, A. B
Format: Article
Language:English
Subjects:
Carbon allotropes
Compressibility
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Superconducting materials (excluding high-tc compounds)
Superconductivity
Superconductors
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Summary:X-ray diffraction and diamond anvil techniques were used to measure the isothermal compressibility of K(3)C(60) and Rb(3)C(60), the superconducting, binary alkali-metal intercalation compounds of solid buckminsterfullerene. These results, combined with the pressure dependence of the superconducting onset temperature T(c) measured by other groups, establish a universal first-order relation between T(c) and the lattice parameter a over a broad range, between 13.9 and 14.5 angstroms. A small secondorder intercalate-specific effect was observed that appears to rule out the participation of intercalate-fullerene optic modes in the pairing interaction.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.255.5046.833