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Electron-phonon interaction in Graphite Intercalation Compounds | | Lilia Boeri
; Giovanni B. Bachelet
; Matteo Giantomassi
; Ole K. Andersen
; | | Date: |
15 Jan 2007 | | Subject: | Superconductivity; Materials Science | | Abstract: | 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. | | Source: | arXiv, cond-mat/0701347 | | Services: | Forum | Review | PDF | Favorites | |
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