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Science 23 August 1991:
Vol. 253. no. 5022, pp. 886 - 888
DOI: 10.1126/science.253.5022.886
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Articles

(RbxK1–x)3C60 Superconductors: Formation of a Continuous Series of Solid Solutions

CHIA-CHUN CHEN 1, STEPHEN P. KELTY 1, and CHARLES M. LIEBER 1

1 Department of Chemistry and Division of Applied Sciences, Harvard University, Cambridge, MA 02138

By means of an approach that employs alkali-metal alloys, bulk single-phase (RbxK1–x)3C6O superconductors have been prepared for all x between 0 and 1. For x = 1 it is shown that the maximum superconducting fraction, which approaches 100% in sintered pellets, occurs at a Rb to C60 ratio of 3:1. More importantly, single-phase superconductors are formed at all intermediate values of x, and it is shown that the transition temperature (Tc) increases linearly with x in this series of materials. The formation of a continuous range of solid solutions demonstrates that the rubidium- and potassium-doped C60 superconducting phases must be isostructural, and furthermore, suggests that the linear increase in Tc with x results from a chemical pressure effect.

Submitted on July 18, 1991
Accepted on July 31, 1991


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Tunneling Spectroscopy of M3C60 Superconductors: The Energy Gap, Strong Coupling, and Superconductivity.
Z. ZHANG, C.-C. CHEN, and C. M. LIEBER (1991)
Science 254, 1619-1621
   Abstract »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)