Superconductivity in Ca-doped graphene laminates

Despite graphene’s long list of exceptional electronic properties and many theoretical predictions regarding the possibility of superconductivity in graphene, its direct and unambiguous experimental observation has not been achieved. We searched for superconductivity in weakly interacting, metal dec...

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Main Authors:	Chapman, J., Su, Y., Howard, C. A., Kundys, D., Grigorenko, A. N., Guinea, F., Geim, A. K., Grigorieva, I. V., Nair, R. R.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4793231/

id	pubmed-4793231
recordtype	oai_dc
spelling	pubmed-47932312016-03-16 Superconductivity in Ca-doped graphene laminates Chapman, J. Su, Y. Howard, C. A. Kundys, D. Grigorenko, A. N. Guinea, F. Geim, A. K. Grigorieva, I. V. Nair, R. R. Article Despite graphene’s long list of exceptional electronic properties and many theoretical predictions regarding the possibility of superconductivity in graphene, its direct and unambiguous experimental observation has not been achieved. We searched for superconductivity in weakly interacting, metal decorated graphene crystals assembled into so-called graphene laminates, consisting of well separated and electronically decoupled graphene crystallites. We report robust superconductivity in all Ca-doped graphene laminates. They become superconducting at temperatures (Tc) between ≈4 and ≈6 K, with Tc’s strongly dependent on the confinement of the Ca layer and the induced charge carrier concentration in graphene. We find that Ca is the only dopant that induces superconductivity in graphene laminates above 1.8 K among several dopants used in our experiments, such as potassium, caesium and lithium. By revealing the tunability of the superconducting response through doping and confinement of the metal layer, our work shows that achieving superconductivity in free-standing, metal decorated monolayer graphene is conditional on an optimum confinement of the metal layer and sufficient doping, thereby bringing its experimental realization within grasp. Nature Publishing Group 2016-03-16 /pmc/articles/PMC4793231/ /pubmed/26979564 http://dx.doi.org/10.1038/srep23254 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International 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/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Chapman, J. Su, Y. Howard, C. A. Kundys, D. Grigorenko, A. N. Guinea, F. Geim, A. K. Grigorieva, I. V. Nair, R. R.
spellingShingle	Chapman, J. Su, Y. Howard, C. A. Kundys, D. Grigorenko, A. N. Guinea, F. Geim, A. K. Grigorieva, I. V. Nair, R. R. Superconductivity in Ca-doped graphene laminates
author_facet	Chapman, J. Su, Y. Howard, C. A. Kundys, D. Grigorenko, A. N. Guinea, F. Geim, A. K. Grigorieva, I. V. Nair, R. R.
author_sort	Chapman, J.
title	Superconductivity in Ca-doped graphene laminates
title_short	Superconductivity in Ca-doped graphene laminates
title_full	Superconductivity in Ca-doped graphene laminates
title_fullStr	Superconductivity in Ca-doped graphene laminates
title_full_unstemmed	Superconductivity in Ca-doped graphene laminates
title_sort	superconductivity in ca-doped graphene laminates
description	Despite graphene’s long list of exceptional electronic properties and many theoretical predictions regarding the possibility of superconductivity in graphene, its direct and unambiguous experimental observation has not been achieved. We searched for superconductivity in weakly interacting, metal decorated graphene crystals assembled into so-called graphene laminates, consisting of well separated and electronically decoupled graphene crystallites. We report robust superconductivity in all Ca-doped graphene laminates. They become superconducting at temperatures (Tc) between ≈4 and ≈6 K, with Tc’s strongly dependent on the confinement of the Ca layer and the induced charge carrier concentration in graphene. We find that Ca is the only dopant that induces superconductivity in graphene laminates above 1.8 K among several dopants used in our experiments, such as potassium, caesium and lithium. By revealing the tunability of the superconducting response through doping and confinement of the metal layer, our work shows that achieving superconductivity in free-standing, metal decorated monolayer graphene is conditional on an optimum confinement of the metal layer and sufficient doping, thereby bringing its experimental realization within grasp.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4793231/
_version_	1613552379046658048

Superconductivity in Ca-doped graphene laminates

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