Alkali-fulleride superconductors: Synthesis, composition, and diamagnetic shielding

Károly Holczer, Oliviér Klein, Shiou Mei Huang, Richard B. Kaner, Ke Jian Fu, Robert L. Whetten, François Diederich

Research output: Contribution to journalArticlepeer-review

660 Scopus citations

Abstract

The recent report of a superconductivity onset near the critical temperature Tc = 18 K in potassium-doped C60 raises questions concerning the composition and stability of the superconducting phase. The effects of mixing and heat treatment of Kx C60 samples prepared over a wide range of initial compositions on the superconducting transition was determined from shielding diamagnetism measurements. A single superconducting phase (Tc = 19.3 K) occurs for which the composition is K3C60. The shielding reaches a maximum of greater than 40 percent of the perfect diamagnetism, a high value for a powder sample, in samples prepared from 3:1 mixtures. A RbxC60 sample prepared and analyzed in an analogous way exhibited evidence for superconductivity with Tc = 30 K and a diamagnetic shielding of 7 percent could be obtained.

Original languageEnglish (US)
Pages (from-to)1154-1157
Number of pages4
JournalScience
Volume252
Issue number5009
DOIs
StatePublished - May 24 1991
Externally publishedYes

ASJC Scopus subject areas

  • General

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