Effect of pressure on superconducting Ca-intercalated graphite CaC6

被引：63

作者：

Kim, J. S.

Boeri, L.

Kremer, R. K.

Razavi, F. S.

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Brock Univ, Dept Phys, St Catharines, ON L2S 3A1, Canada

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.74.214513

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of pressure on the superconducting transition temperature (T-c) of the Ca-intercalated graphite compound CaC6 has been investigated up to similar to 16 kbar. T-c is found to increase under pressure with a large relative ratio Delta T-c/T-c of approximate to 0.4%/kbar. Using first-principles calculations, we show that the positive effect of pressure on T-c can be explained within the scope of electron-phonon theory due to the presence of a soft phonon branch associated with in-plane vibrations of the Ca atoms. The implications of the present findings for the current debate about the superconducting mechanism in graphite intercalation compounds are discussed.

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页数：6

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