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Foreign atoms trigger superconductivity in carbon Bulk quantities of a new carbon-based superconductor have been made by physicists in France. Known as CaC6, the material contains "foreign" carbon atoms inserted between hexagonal two-dimensional sheets of graphite. The technique for making the material was devised by Nicolas Emery of the University Henri Poincaré in Nancy and colleagues at the University of Paris 6 & 7. The material becomes a superconductor when cooled to below 11.5 Kelvin.
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