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Intercalant-independent transition temperature in superconducting black phosphorus

Research on black phosphorus has been experiencing a renaissance over the last years, after the demonstration that few-layer crystals exhibit high carrier mobility and a thickness-dependent bandgap. Black phosphorus is also known to be a superconductor under high pressure exceeding 10 GPa. The super...

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Autores principales: Zhang, R., Waters, J., Geim, A. K., Grigorieva, I. V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5394339/
https://www.ncbi.nlm.nih.gov/pubmed/28401904
http://dx.doi.org/10.1038/ncomms15036
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author Zhang, R.
Waters, J.
Geim, A. K.
Grigorieva, I. V.
author_facet Zhang, R.
Waters, J.
Geim, A. K.
Grigorieva, I. V.
author_sort Zhang, R.
collection PubMed
description Research on black phosphorus has been experiencing a renaissance over the last years, after the demonstration that few-layer crystals exhibit high carrier mobility and a thickness-dependent bandgap. Black phosphorus is also known to be a superconductor under high pressure exceeding 10 GPa. The superconductivity is due to a structural transformation into another allotrope and accompanied by a semiconductor-metal transition. No superconductivity could be achieved for black phosphorus in its normal orthorhombic form, despite several reported attempts. Here we describe its intercalation by several alkali metals (Li, K, Rb and Cs) and alkali-earth Ca. All the intercalated compounds are found to be superconducting, exhibiting the same (within experimental accuracy) critical temperature of 3.8±0.1 K and practically identical characteristics in the superconducting state. Such universal superconductivity, independent of the chemical composition, is highly unusual. We attribute it to intrinsic superconductivity of heavily doped individual phosphorene layers, while the intercalated layers of metal atoms play mostly a role of charge reservoirs.
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spelling pubmed-53943392017-05-17 Intercalant-independent transition temperature in superconducting black phosphorus Zhang, R. Waters, J. Geim, A. K. Grigorieva, I. V. Nat Commun Article Research on black phosphorus has been experiencing a renaissance over the last years, after the demonstration that few-layer crystals exhibit high carrier mobility and a thickness-dependent bandgap. Black phosphorus is also known to be a superconductor under high pressure exceeding 10 GPa. The superconductivity is due to a structural transformation into another allotrope and accompanied by a semiconductor-metal transition. No superconductivity could be achieved for black phosphorus in its normal orthorhombic form, despite several reported attempts. Here we describe its intercalation by several alkali metals (Li, K, Rb and Cs) and alkali-earth Ca. All the intercalated compounds are found to be superconducting, exhibiting the same (within experimental accuracy) critical temperature of 3.8±0.1 K and practically identical characteristics in the superconducting state. Such universal superconductivity, independent of the chemical composition, is highly unusual. We attribute it to intrinsic superconductivity of heavily doped individual phosphorene layers, while the intercalated layers of metal atoms play mostly a role of charge reservoirs. Nature Publishing Group 2017-04-12 /pmc/articles/PMC5394339/ /pubmed/28401904 http://dx.doi.org/10.1038/ncomms15036 Text en Copyright © 2017, The Author(s) 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
Zhang, R.
Waters, J.
Geim, A. K.
Grigorieva, I. V.
Intercalant-independent transition temperature in superconducting black phosphorus
title Intercalant-independent transition temperature in superconducting black phosphorus
title_full Intercalant-independent transition temperature in superconducting black phosphorus
title_fullStr Intercalant-independent transition temperature in superconducting black phosphorus
title_full_unstemmed Intercalant-independent transition temperature in superconducting black phosphorus
title_short Intercalant-independent transition temperature in superconducting black phosphorus
title_sort intercalant-independent transition temperature in superconducting black phosphorus
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5394339/
https://www.ncbi.nlm.nih.gov/pubmed/28401904
http://dx.doi.org/10.1038/ncomms15036
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