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Metal intercalation to graphite produces various types of superconductors. The highest superconducting transition temperature Tc (onset temperature, Tconset, of 11.5 K) was found in Ca intercalated graphite, denoted CaC6. Tconset increased up to 15.1 K at 7.5 GPa, implying a positive pressure dependence. However, no new metal-intercalated graphite superconductors with Tconset higher than 11.5 K at...
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