Valla, T;
Camacho, J;
Pan, ZH;
Fedorov, AV;
Walters, AC;
Howard, CA;
Ellerby, M;
(2009)
Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in Superconducting CaC6 using Angle-Resolved Photoemission Spectroscopy.
PHYS REV LETT
, 102
(10)
, Article 107007. 10.1103/PhysRevLett.102.107007.
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Abstract
We present the first angle-resolved photoemission studies of electronic structure in CaC6, a superconducting graphite intercalation compound with T-c=11.6 K. We find that, contrary to theoretical models, the electron-phonon coupling on the graphene-derived Fermi sheets with high-frequency graphene-derived phonons is surprisingly strong and anisotropic. The shape of the Fermi surface is found to favor a dynamical intervalley nesting via exchange of high-frequency phonons. Our results suggest that graphene sheets play a crucial role in superconductivity in graphite intercalation compounds.
| Type: | Article |
|---|---|
| Title: | Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in Superconducting CaC6 using Angle-Resolved Photoemission Spectroscopy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.102.107007 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.102.107007 |
| Language: | English |
| Additional information: | © 2009 The American Physical Society |
| Keywords: | GRAPHITE, INTERCALATION, ENERGY, STATE |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/136485 |
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