Superconductivity in Heavy Alkaline-Earths Intercalated Graphites

Details Superconductivity in Heavy Alkaline-Earths Intercalated Graphites Superconductivity in Heavy Alkaline-Earths Intercalated Graphites

2007-03-30

arxiv.org/abs/cond-mat/0703817v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.99.027001

We report the discovery of superconductivity below 1.65(6) K in Sr-intercalated graphite SrC6, by susceptibility and specific heat (Cp) measurements. In comparison with CaC6, we found that the anisotropy of the upper critical fields for SrC6 is much reduced. The Cp anomaly at Tc is smaller than the BCS prediction indicating an anisotropic superconducting gap for SrC6 similar to CaC6. The significantly lower Tc of SrC6 as compared to CaC6 can be understood in terms of "negative" pressure effects, which decreases the electron-phonon coupling for both in-plane intercalant and the out-of-plane C phonon modes. We observed no superconductivity for BaC6 down to 0.3 K.

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