Absence of saturation in the normal-state resistivity of thin films of K3C60 and Rb3C60

A. F. Hebard*, T. T M Palstra, R. C. Haddon, R. M. Fleming

*Corresponding author for this work

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Abstract

Crystalline films of C60 with ∼1 μm grain size and a preferred [111] texture have been doped with K and Rb to form superconducting compositions that have sharp zero-resistance transitions. The temperature dependence of the resistance above Tc for both K3C60 and Rb3C60 films reveals metallic behavior up to temperatures as high as 520 K without any evidence of saturation. For Rb3C60, electronic mean free paths significantly shorter than nearest-neighbor C60 distances and anomalously high values of the electron-phonon coupling strength are inferred. These results suggest that there is a strong interaction between the conduction electrons and the intramolecular vibrational modes and also bring into question the assumption that all of the donated charge (three electrons per C60) is itinerant.

Original languageEnglish
Pages (from-to)9945-9948
Number of pages4
JournalPhysical Review B
Volume48
Issue number13
DOIs
Publication statusPublished - 1 Jan 1993
Externally publishedYes

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