Alkali-metal isotope effect in Rb3C60

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Abstract

The rubidium isotope effect has been measured in superconducting crystals of Rb3C60. With Tc∞Mα, we find αRb=−0.028±0.036. This result puts constraints on the superconducting mechanism in Rb3C60.

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This work was supported by NSF grants DMR-9017254 and DMR-9120296 and the Department of Energy under contract DE-AC03-76SF00098.

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