Pressure-induced enhancement of superconductivity and superconducting-superconducting transition in CaC$\_6$

Andrea Gauzzi, S. Takashima, N. Takeshita +6

We measured the electrical resistivity, $\varrho (T)$, of superconducting CaC$\_6$ at ambient and high pressure up to 16 GPa. For $P\le$8 GPa, we found a large increase of $T\_c$…