2006/03/16 by Andrea Gauzzi, S. Takashima, Gauzzi, Andrea +15
Physics and Astronomy · #FOS: Physical sciences #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0603443
arxiv created 2006/03/16 · arxiv updated 2009/12/01
We measured the electrical resistivity, \varrho(T), of superconducting CaC_6 at ambient and high pressure up to 16 GPa. For P ≤8 GPa, we found a large increase of T_c with pressure from 11.5 up to 15.1 K. At 8 GPa, T_c drops and levels off at 5 K above 10 GPa. Correspondingly, the residual \varrho increases by ≈ 200 times and the \varrho(T) behavior becomes flat. The recovery of the pristine behavior after depressurization is suggestive of a phase transition at 8 GPa between two superconducting phases with good and bad metallic properties, the latter with a lower T_c and more static disorder.