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Synthesis and superconducting properties of CaC6
Nicolas Emery1, Claire Hérold1, Jean-François Marêché1
1Laboratoire de Chimie du Solide Minéral-UMR 7555, Nancy Université, Université Henri Poincaré, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France.
Abstract:
Among the superconducting graphite intercalation compounds, CaC6 exhibits the highest critical temperature Tc=11.5 K. Bulk samples of CaC6 are obtained by immersing highly oriented pyrographite pieces in a well-chosen liquid Li-Ca alloy for 10 days at 350 °C. The crystal structure of CaC6 belongs to the [Formula: see text] space group. In order to study the superconducting properties of CaC6, magnetisation was measured as a function of temperature and direction of magnetic field applied parallel or perpendicular to the c-axis. Meissner effect was evidenced, as well as a type II superconducting behaviour and a small anisotropy. In agreement with calculations, experimental results obtained from various techniques suggest that a classical electron-phonon mechanism is responsible for the superconductivity of CaC6. Application of high pressure increases the Tc up to 15.1 K at 8 GPa.
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