Unresolved problems in superconductivity of CaC6

Details Unresolved problems in superconductivity of CaC6 Unresolved problems in superconductivity of CaC6

2006-06-15

arxiv.org/abs/cond-mat/0606404v1

Physics

Condensed Matter

Superconductivity

Contribution to the Proceedings of the M2S Conference in Dresden, 2006

Scientific paper

10.1016/j.physc.2007.03.276

We discuss the current status of the theory of the "high-temperature" superconductivity in intercalated graphites YbC6 and CaC6. We emphasize that while the general picture of conventional, phonon-driven superconductivity has already emerged and is generally accepted, there are still interesting problems with this picture, such as weak-coupling regime inferred from specific heat suggesting coupling exclusively with high-energy carbon phonons coming in direct contradiction with the isotope effect measurements suggesting coupling exclusively with the low-energy intercalant modes. At the same time, the first principle calculations, while explaining Tc, contradict both of the experiments above by predicting equal coupling with both groups of phonons.

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