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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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Autores principales: Chapman, J., Su, Y., Howard, C. A., Kundys, D., Grigorenko, A. N., Guinea, F., Geim, A. K., Grigorieva, I. V., Nair, R. R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4793231/
https://www.ncbi.nlm.nih.gov/pubmed/26979564
http://dx.doi.org/10.1038/srep23254
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author Chapman, J.
Su, Y.
Howard, C. A.
Kundys, D.
Grigorenko, A. N.
Guinea, F.
Geim, A. K.
Grigorieva, I. V.
Nair, R. R.
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.
collection PubMed
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 (T(c)) between ≈4 and ≈6 K, with T(c)’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.
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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. Sci Rep 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 (T(c)) between ≈4 and ≈6 K, with T(c)’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/
spellingShingle Article
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
title 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_short Superconductivity in Ca-doped graphene laminates
title_sort superconductivity in ca-doped graphene laminates
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4793231/
https://www.ncbi.nlm.nih.gov/pubmed/26979564
http://dx.doi.org/10.1038/srep23254
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