Theoretical Explanation of Superconductivity in C6Ca. - Archive ouverte HAL
Article Dans Une Revue Physical Review Letters Année : 2005

Theoretical Explanation of Superconductivity in C6Ca.

Résumé

Using density functional theory, we demonstrate that superconductivity in C6Ca is phonon mediated with lambda=0.83 and phonon frequency log=24.7 meV. The calculated isotope exponents are alpha(Ca)=0.24 and alpha(C)=0.26. Superconductivity is due mostly to C vibrations perpendicular and Ca vibrations parallel to the graphite layers. Since the electron-phonon couplings of these modes are activated by the presence of an intercalant Fermi surface, the occurrence of superconductivity in graphite intercalated compounds requires a noncomplete ionization of the intercalant.
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Dates et versions

hal-00020143 , version 1 (06-03-2006)

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M. Calandra, Francesco Mauri. Theoretical Explanation of Superconductivity in C6Ca.. Physical Review Letters, 2005, 95, pp.237002. ⟨10.1103/PhysRevLett.95.237002⟩. ⟨hal-00020143⟩
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