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, namely, the existence of a strong dormant electron-phonon interaction between interlayer and pi(*) electrons, for which we provide a simple geometrical explanation in terms of 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.

Electron-phonon interaction in graphite intercalation compounds / Boeri, Lilia; Bachelet, Giovanni Battista; Matteo, Giantomassi; O. K., Andersen. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 76:6(2007), pp. 064510-1-064510-14. [10.1103/physrevb.76.064510]

Electron-phonon interaction in graphite intercalation compounds

BOERI, Lilia;BACHELET, Giovanni Battista;
2007

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, namely, the existence of a strong dormant electron-phonon interaction between interlayer and pi(*) electrons, for which we provide a simple geometrical explanation in terms of 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.
2007
01 Pubblicazione su rivista::01a Articolo in rivista
Electron-phonon interaction in graphite intercalation compounds / Boeri, Lilia; Bachelet, Giovanni Battista; Matteo, Giantomassi; O. K., Andersen. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 76:6(2007), pp. 064510-1-064510-14. [10.1103/physrevb.76.064510]
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/16018
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 59
  • ???jsp.display-item.citation.isi??? 52
social impact