Pressure dependence of the superconducting transition temperature in C6Yb and C6Ca
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 0-1.2GPa the superconducting transition temperature increases linearly with pressure in both materials with dTc/dP=+0.37±0.01 and +0.50±0.05K/GPa for C6Yb and C6Ca , respectively. The transition temperature in C6Yb , which has been measured up to 2.3GPa , reaches a peak at around 1.8GPa and then starts to drop. We also discuss how this pressure dependence may be explained within a plasmon pairing mechanism.
- Publication:
-
Physical Review B
- Pub Date:
- July 2006
- DOI:
- 10.1103/PhysRevB.74.024505
- Bibcode:
- 2006PhRvB..74b4505S
- Keywords:
-
- 74.25.Dw;
- 74.62.Fj;
- 74.70.-b;
- Superconductivity phase diagrams;
- Pressure effects;
- Superconducting materials