Superconductivity at 30 K in caesium-doped C60

Stephen P. Kelty, Chia Chun Chen, Charles M. Lieber

Research output: Contribution to journalArticle

191 Citations (Scopus)

Abstract

RECENTLY there has been significant effort directed towards exploring the physical and chemical properties of C60 and other large carbon clusters1-11. Particularly intriguing are reports of superconductivity in potassium- and rubidium-doped C60 crystals and films5-7. The transition temperatures (Tc) for K-doped C60 (18 K) and Rb-doped C60 (∼28 K) are significantly higher than those reported previously for other molecular superconductors12. Earlier attempts to prepare a caesium-doped superconducting phase7 have proved unsuccessful. Here we report that a Cs-doped superconductor can be prepared by using as the dopant binary alloys of the type CsM (where M is Hg, Tl or Bi). We observe a reproducible superconducting transition in CsxC60 (x = 1.2-3) at 30 K, demonstrated by flux expulsion (the Meissner effect) and flux exclusion (shielding) d.c. magnetization measurements. The low superconducting volume fraction (∼1%) suggests that further studies will be needed to determine the optimal doping concentra-tion and to place tighter bounds on Tc.

Original languageEnglish
Pages (from-to)223-225
Number of pages3
JournalNature
Volume352
Issue number6332
DOIs
Publication statusPublished - 1991 Jan 1

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Cesium
Rubidium
Transition Temperature
Potassium
Carbon
Superconductivity

ASJC Scopus subject areas

  • General

Cite this

Superconductivity at 30 K in caesium-doped C60. / Kelty, Stephen P.; Chen, Chia Chun; Lieber, Charles M.

In: Nature, Vol. 352, No. 6332, 01.01.1991, p. 223-225.

Research output: Contribution to journalArticle

Kelty, SP, Chen, CC & Lieber, CM 1991, 'Superconductivity at 30 K in caesium-doped C60', Nature, vol. 352, no. 6332, pp. 223-225. https://doi.org/10.1038/352223a0
Kelty, Stephen P. ; Chen, Chia Chun ; Lieber, Charles M. / Superconductivity at 30 K in caesium-doped C60. In: Nature. 1991 ; Vol. 352, No. 6332. pp. 223-225.
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