Abstract
Effect of pressure on the superconductivity of stage 2 graphite intercalation compounds with alkali-metal amalgams, C 8KHg and C 8RbHg, is investigated. The coherence length along the c-axis, which is about 100 Å at ambient pressure increases with pressure, while that in the layer plane, being about 2000 Å, remains essentially constant, i.e. the application of pressure suppresses the two-dimensional anisotropy of the superconductivity. The superconducting transition temperature T c at ambient pressure and its pressure coefficient dT c/dp are 1.88 K and -6.3 × 10 -5 K·bar -1 for C 8 KHg, and 1.41 K and -5.3 × 10 -5 K·bar -1 for C 8RbHg.
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