Pressure dependence of the superconducting transition temperature in C$_6$Yb and C$_6$Ca

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

doi:10.1016/j.physb.2006.01.327

paper

Pressure dependence of the superconducting transition temperature in C $_{6}$ Yb and C $_{6}$ Ca

arXiv:cond-mat/0604204 · doi:10.1016/j.physb.2006.01.327

Abstract

We have studied the evolution, with hydrostatic pressure, of the recently discovered superconductivity in the graphite intercalation compounds C $_{6}$ Yb and C $_{6}$ Ca. 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 $d T_{c} / d P = + 0.39 K / GP a$ and $d T_{c} / d P = + 0.50 K / GP a$ for C $_{6}$ Yb and C $_{6}$ Ca respectively. The transition temperature in C $_{6}$ Yb, 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.

4 pages, 3 figures

Pressure dependence of the superconducting transition temperature in C6​Yb and C6​Ca

Abstract

Pressure dependence of the superconducting transition temperature in C $_{6}$ Yb and C $_{6}$ Ca