Pressure dependence of the superconducting transition temperature in C6Yb and C6Ca
Robert P. Smith, Anna Kusmartseva, Yuen T. C. Ko, Siddharth S Saxena, Ana Akrap, Laszlo Forro, Mukul Laad, Thomas E. Weller, Mark Ellerby, Neal T. Skipper
Abstract
We have studied the evolution, with hydrostatic pressure, of the recently discovered superconductivity in the graphite intercalation compounds C6Yb and C6Ca. We present pressure-temperature phase diagrams, for both superconductors, established by electrical transport and magnetization measurements. In the range 0-1.2 GPa the superconducting transition temperature increases linearly with pressure in both materials with dTc/dP = +0.39 K/GPa and dTc/dP = +0.50 K/GPa for C6Yb and C6Ca respectively. The transition temperature in C6Yb, which has beenmeasured up to 2.3 GPa, reaches a peak at around 1.8 GPa and then starts to drop. We also discuss how this pressure dependence may be explained within a plasmon pairing mechanism.
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