Electron-phonon interaction in Graphite Intercalation Compounds

Details Electron-phonon interaction in Graphite Intercalation Compounds Electron-phonon interaction in Graphite Intercalation Compounds

2007-01-15

arxiv.org/abs/cond-mat/0701347v1

Physics

Condensed Matter

Superconductivity

13 pages, 12 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.064510

Motivated by the recent discovery of superconductivity in Ca- and Yb-intercalated graphite (CaC$_{6}$ and YbC$_{6}$) and from the ongoing debate on the nature and role of the interlayer state in this class of compounds, in this work we critically study the electron-phonon properties of a simple model based on primitive graphite. We show that this model captures an essential feature of the electron-phonon properties of the Graphite Intercalation Compounds (GICs), namely, the existence of a strong dormant electron-phonon interaction between interlayer and $\pi ^{\ast}$ electrons, for which we provide a simple geometrical explanation in terms of NMTO Wannier-like functions. Our findings correct the oversimplified view that nearly-free-electron states cannot interact with the surrounding lattice, and explain the empirical correlation between the filling of the interlayer band and the occurrence of superconductivity in Graphite-Intercalation Compounds.

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