Effect of Pressure on Superconducting Ca-intercalated Graphite CaC$_6$

Details Effect of Pressure on Superconducting Ca-intercalated Graphite CaC$_6$ Effect of Pressure on Superconducting Ca-intercalated Graphite CaC$_6$

2006-03-20

arxiv.org/abs/cond-mat/0603530v3

Phys. Rev. B 74, 214513 (2006)

Physics

Condensed Matter

Superconductivity

6 pages, 5 figs, final PRB version

Scientific paper

The pressure effect on the superconducting transition temperature ($T_c$) of the newly-discovered Ca-intercalated graphite compound CaC$_6$ has been investigated up to $\sim$ 16 kbar. $T_c$ is found to increase under pressure with a large relative ratio $\Delta$$T_c$/$T_c$ of $\approx$ +0.4 %/kbar. Using first-principles calculations, we show that the large and positive effect of pressure on $T_c$ can be explained in the scope of electron-phonon theory due to the presence of a soft phonon branch associated to in-plane vibrations of Ca atoms. Implications of the present findings on the current debate about the superconducting mechanism in graphite intercalation compounds are discussed.

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