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Unresolved problems in superconductivity of CaC6

MPS-Authors
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Mazin,  I. I.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Boeri,  L.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Dolgov,  O. V.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Golubov,  A. A.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Andersen,  O. K.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Mazin, I. I., Boeri, L., Dolgov, O. V., Golubov, A. A., Bachelet, G. B., Giantomassi, M., et al. (2007). Unresolved problems in superconductivity of CaC6. Physica C, 460, 116-120.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B5AC-4
Abstract
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 in turn suggesting coupling exclusively with the low-energy intercalant modes. At the same time, the first principle calculations, while explaining T-c, contradict both the experiments above by predicting equal coupling with both groups of phonons. (c) 2007 Elsevier B.V. All rights reserved.