%0 Journal Article
%@ 1098-0121
%A Smith, RP
%A Kusmartseva, A
%A Ko, YTC
%A Saxena, SS
%A Akrap, A
%A Forro, L
%A Laad, M
%A Weller, TE
%A Ellerby, M
%A Skipper, NT
%D 2006
%F discovery:9476
%I AMER PHYSICAL SOC
%J PHYS REV B
%K GRAPHITE-INTERCALATION COMPOUNDS, STATE
%N 2
%P ? - ?
%T Pressure dependence of the superconducting transition temperature in C6Yb and C6Ca
%U https://discovery.ucl.ac.uk/id/eprint/9476/
%V 74
%X 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 dT(c)/dP=+0.37 +/- 0.01 and +0.50 +/- 0.05 K/GPa for C6Yb and C6Ca, respectively. The transition temperature in C6Yb, which has been measured 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. (c) 2006 American Institute of Physics.