Superconductivity of bulk CaC6
N. Emery, C. Herold, M. d Astuto, V. Garcia, Ch. Bellin, J.F. Mareche,, P. Lagrange, G. Loupias
TL;DR
This paper reports the synthesis, structural characterization, and discovery of superconductivity at 11.5K in bulk CaC6, a graphite intercalation compound with rhombohedral symmetry.
Contribution
It introduces a novel synthesis method for bulk CaC6 and confirms its rhombohedral structure and superconducting properties.
Findings
Superconductivity observed at 11.5K in bulk CaC6
Complete crystal structure determination showing rhombohedral symmetry
Successful synthesis from highly oriented pyrolytic graphite
Abstract
We have obtained bulk samples of the graphite intercalation compound, CaC6, by a novel method of synthesis from highly oriented pyrolytic graphite. The crystal structure has been completely determined showing that it is the only member of the MC6, metal-graphite compounds, which has rhombohedral symmetry. We have clearly shown the occurrence of superconductivity in the bulk sample at 11.5K, using magnetization measurements.
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