Superconductivity of Bulk CaC6.

N. Emery (1) , C. Hérold (1) , M. d'Astuto (2) , V. Garcia (3) , Ch. Bellin (2) , J. F. Marêché (1) , P. Lagrange (1) , G. Loupias (2)

1 LCSM - Laboratoire de chimie du solide minéral
2 IMPMC - Institut de minéralogie et de physique des milieux condensés
3 INSP - Institut des Nanosciences de Paris

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 that has rhombohedral symmetry. We have clearly shown the occurrence of superconductivity in the bulk sample at 11.5 K, using magnetization measurements.

Mots clés: calcium compounds; graphite intercalation compounds; crystal structure; crystal symmetry; magnetisation; superconducting transition temperature; type II superconductors

N. Emery, C. Hérold, M. d'Astuto, V. Garcia, Ch. Bellin, et al.. Superconductivity of Bulk CaC6.. Physical Review Letters, 2005, 95, pp.087003/1-4. ⟨10.1103/PhysRevLett.95.087003⟩. ⟨hal-00020221⟩