Yang, S-L;
Sobota, JA;
Howard, CA;
Pickard, CJ;
Hashimoto, M;
Lu, DH;
Mo, S-K;
... Shen, Z-X; + view all
(2014)
Superconducting graphene sheets in CaC6 enabled by phonon-mediated interband interactions.
NATURE COMMUNICATIONS
, 5
, Article ARTN 3493. 10.1038/ncomms4493.
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Abstract
There is a great deal of fundamental and practical interest in the possibility of inducing superconductivity in a monolayer of graphene. But while bulk graphite can be made to superconduct when certain metal atoms are intercalated between its graphene sheets, the same has not been achieved in a single layer. Moreover, there is a considerable debate about the precise mechanism of superconductivity in intercalated graphite. Here we report angle-resolved photoelectron spectroscopy measurements of the superconducting graphite intercalation compound CaC6 that distinctly resolve both its intercalant-derived interlayer band and its graphene-derived π* band. Our results indicate the opening of a superconducting gap in the π* band and reveal a substantial contribution to the total electron–phonon-coupling strength from the π*-interlayer interband interaction. Combined with theoretical predictions, these results provide a complete account for the superconducting mechanism in graphite intercalation compounds and lend support to the idea of realizing superconducting graphene by creating an adatom superlattice.
| Type: | Article |
|---|---|
| Title: | Superconducting graphene sheets in CaC6 enabled by phonon-mediated interband interactions |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/ncomms4493 |
| Publisher version: | http://dx.doi.org/10.1038/ncomms4493 |
| Additional information: | & 2014 Macmillan Publishers Limited. All rights reserved. This work is licensed under a Creative Commons Attribution 3.0 Unported License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ NATURE COMMUNICATIONS | DOI: 10.1038/ncomms4493 ARTICLE NATURE PMCID: PMC3973042 PubMed ID: 24651261 |
| Keywords: | Physical sciences; Condensed matter; |
| 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/1430532 |
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