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Observation of superconductivity at 30∼46K in A(x)Fe(2)Se(2 )(A = Li, Na, Ba, Sr, Ca, Yb, and Eu)

New iron selenide superconductors by intercalating smaller-sized alkali metals (Li, Na) and alkaline earths using high-temperature routes have been pursued ever since the discovery of superconductivity at about 30 K in KFe(2)Se(2), but all have failed so far. Here we demonstrate that a series of sup...

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Detalles Bibliográficos
Autores principales: Ying, T. P., Chen, X. L., Wang, G., Jin, S. F., Zhou, T. T., Lai, X. F., Zhang, H., Wang, W. Y.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3361284/
https://www.ncbi.nlm.nih.gov/pubmed/22645642
http://dx.doi.org/10.1038/srep00426
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author Ying, T. P.
Chen, X. L.
Wang, G.
Jin, S. F.
Zhou, T. T.
Lai, X. F.
Zhang, H.
Wang, W. Y.
author_facet Ying, T. P.
Chen, X. L.
Wang, G.
Jin, S. F.
Zhou, T. T.
Lai, X. F.
Zhang, H.
Wang, W. Y.
author_sort Ying, T. P.
collection PubMed
description New iron selenide superconductors by intercalating smaller-sized alkali metals (Li, Na) and alkaline earths using high-temperature routes have been pursued ever since the discovery of superconductivity at about 30 K in KFe(2)Se(2), but all have failed so far. Here we demonstrate that a series of superconductors with enhanced T(c) = 30∼46 K can be obtained by intercalating metals, Li, Na, Ba, Sr, Ca, Yb, and Eu in between FeSe layers by the ammonothermal method at room temperature. Analysis on their powder X-ray diffraction patterns reveals that all the main phases can be indexed based on body-centered tetragonal lattices with a∼3.755–3.831 Å while c∼15.99–20.54 Å. Resistivities show the corresponding sharp transitions at 45 K and 39 K for NaFe(2)Se(2) and Ba(0.8)Fe(2)Se(2), respectively, confirming their bulk superconductivity. These findings provide a new starting point for studying the properties of these superconductors and an effective synthetic route for the exploration of new superconductors as well.
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spelling pubmed-33612842012-05-29 Observation of superconductivity at 30∼46K in A(x)Fe(2)Se(2 )(A = Li, Na, Ba, Sr, Ca, Yb, and Eu) Ying, T. P. Chen, X. L. Wang, G. Jin, S. F. Zhou, T. T. Lai, X. F. Zhang, H. Wang, W. Y. Sci Rep Article New iron selenide superconductors by intercalating smaller-sized alkali metals (Li, Na) and alkaline earths using high-temperature routes have been pursued ever since the discovery of superconductivity at about 30 K in KFe(2)Se(2), but all have failed so far. Here we demonstrate that a series of superconductors with enhanced T(c) = 30∼46 K can be obtained by intercalating metals, Li, Na, Ba, Sr, Ca, Yb, and Eu in between FeSe layers by the ammonothermal method at room temperature. Analysis on their powder X-ray diffraction patterns reveals that all the main phases can be indexed based on body-centered tetragonal lattices with a∼3.755–3.831 Å while c∼15.99–20.54 Å. Resistivities show the corresponding sharp transitions at 45 K and 39 K for NaFe(2)Se(2) and Ba(0.8)Fe(2)Se(2), respectively, confirming their bulk superconductivity. These findings provide a new starting point for studying the properties of these superconductors and an effective synthetic route for the exploration of new superconductors as well. Nature Publishing Group 2012-05-28 /pmc/articles/PMC3361284/ /pubmed/22645642 http://dx.doi.org/10.1038/srep00426 Text en Copyright © 2012, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-sa/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-ShareALike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/
spellingShingle Article
Ying, T. P.
Chen, X. L.
Wang, G.
Jin, S. F.
Zhou, T. T.
Lai, X. F.
Zhang, H.
Wang, W. Y.
Observation of superconductivity at 30∼46K in A(x)Fe(2)Se(2 )(A = Li, Na, Ba, Sr, Ca, Yb, and Eu)
title Observation of superconductivity at 30∼46K in A(x)Fe(2)Se(2 )(A = Li, Na, Ba, Sr, Ca, Yb, and Eu)
title_full Observation of superconductivity at 30∼46K in A(x)Fe(2)Se(2 )(A = Li, Na, Ba, Sr, Ca, Yb, and Eu)
title_fullStr Observation of superconductivity at 30∼46K in A(x)Fe(2)Se(2 )(A = Li, Na, Ba, Sr, Ca, Yb, and Eu)
title_full_unstemmed Observation of superconductivity at 30∼46K in A(x)Fe(2)Se(2 )(A = Li, Na, Ba, Sr, Ca, Yb, and Eu)
title_short Observation of superconductivity at 30∼46K in A(x)Fe(2)Se(2 )(A = Li, Na, Ba, Sr, Ca, Yb, and Eu)
title_sort observation of superconductivity at 30∼46k in a(x)fe(2)se(2 )(a = li, na, ba, sr, ca, yb, and eu)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3361284/
https://www.ncbi.nlm.nih.gov/pubmed/22645642
http://dx.doi.org/10.1038/srep00426
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