P. Lagrange

TL;DR: The crystal structure has been completely determined showing that CaC6 is the only member of the MC6, metal-graphite compounds that has rhombohedral symmetry and the occurrence of superconductivity in the bulk sample at 11.5 K is clearly shown.

TL;DR: The data analysis suggests that a pressure-induced phonon softening related to an in-plane Ca phonon mode is responsible for the Tc increase and that higher pressures greater, similar8 GPa lead to a structural transition into a new phase with a low Tc less, similar3 K.

TL;DR: The tunneling conductance spectra of the newly discovered superconductor CaC6 show a clear superconducting gap in the quasiparticle density of states and the gap function extracted from the spectra is in good agreement with the conventional BCS theory.

TL;DR: The temperature dependence of the in-plane magnetic penetration depth, lambda(ab)(T), has been measured in a c-axis oriented polycrystalline CaC(6) bulk sample using a high-resolution mutual inductance technique, strongly suggesting isotropic s-wave pairing.

TL;DR: In this article, high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy revealed densely packed mats made by single and double-walled carbon nanotubes.