Synthesis and Characterization of Superconducting Ca(1−)(x)Na(x)FFeAs

A representative of the fluoride-containing iron pnictide high-temperature superconductors, namely CaFFeAs, was doped with sodium up to the composition Ca(0.86)Na(0.14)FFeAs for the first time. Single crystals with an edge length in the range of 0.1 – 2.0 mm were obtained via solid-state and flux sy...

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Autores principales: Wolff, Klaus K., Shlyk, Larysa, Bischoff, Markus, Rose, Eva, Niewa, Rainer, Schleid, Thomas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2014
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5453247/
https://www.ncbi.nlm.nih.gov/pubmed/28788551
http://dx.doi.org/10.3390/ma7031984
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author Wolff, Klaus K.
Shlyk, Larysa
Bischoff, Markus
Rose, Eva
Niewa, Rainer
Schleid, Thomas
author_facet Wolff, Klaus K.
Shlyk, Larysa
Bischoff, Markus
Rose, Eva
Niewa, Rainer
Schleid, Thomas
author_sort Wolff, Klaus K.
collection PubMed
description A representative of the fluoride-containing iron pnictide high-temperature superconductors, namely CaFFeAs, was doped with sodium up to the composition Ca(0.86)Na(0.14)FFeAs for the first time. Single crystals with an edge length in the range of 0.1 – 2.0 mm were obtained via solid-state and flux syntheses, respectively. The composition of the crystals was verified by means of single crystal X-ray diffractometry and energy dispersive X-ray spectroscopy (EDX). Measurements of the electrical resistivity, as well as the magnetization on a crystal of Ca(0.89)Na(0.11)FFeAs both show a transition to the superconducting state on cooling to 34.5 K. Investigations of the upper critical fields reveal an anisotropy ratio of about five. The lattice parameters and molar volumes increase with rising sodium content. This effect is clearly observable for the c-axis and the volume, whereas the increase of the a-axis is rather minor.
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spelling pubmed-54532472017-07-28 Synthesis and Characterization of Superconducting Ca(1−)(x)Na(x)FFeAs Wolff, Klaus K. Shlyk, Larysa Bischoff, Markus Rose, Eva Niewa, Rainer Schleid, Thomas Materials (Basel) Article A representative of the fluoride-containing iron pnictide high-temperature superconductors, namely CaFFeAs, was doped with sodium up to the composition Ca(0.86)Na(0.14)FFeAs for the first time. Single crystals with an edge length in the range of 0.1 – 2.0 mm were obtained via solid-state and flux syntheses, respectively. The composition of the crystals was verified by means of single crystal X-ray diffractometry and energy dispersive X-ray spectroscopy (EDX). Measurements of the electrical resistivity, as well as the magnetization on a crystal of Ca(0.89)Na(0.11)FFeAs both show a transition to the superconducting state on cooling to 34.5 K. Investigations of the upper critical fields reveal an anisotropy ratio of about five. The lattice parameters and molar volumes increase with rising sodium content. This effect is clearly observable for the c-axis and the volume, whereas the increase of the a-axis is rather minor. MDPI 2014-03-07 /pmc/articles/PMC5453247/ /pubmed/28788551 http://dx.doi.org/10.3390/ma7031984 Text en © 2014 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Wolff, Klaus K.
Shlyk, Larysa
Bischoff, Markus
Rose, Eva
Niewa, Rainer
Schleid, Thomas
Synthesis and Characterization of Superconducting Ca(1−)(x)Na(x)FFeAs
title Synthesis and Characterization of Superconducting Ca(1−)(x)Na(x)FFeAs
title_full Synthesis and Characterization of Superconducting Ca(1−)(x)Na(x)FFeAs
title_fullStr Synthesis and Characterization of Superconducting Ca(1−)(x)Na(x)FFeAs
title_full_unstemmed Synthesis and Characterization of Superconducting Ca(1−)(x)Na(x)FFeAs
title_short Synthesis and Characterization of Superconducting Ca(1−)(x)Na(x)FFeAs
title_sort synthesis and characterization of superconducting ca(1−)(x)na(x)ffeas
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5453247/
https://www.ncbi.nlm.nih.gov/pubmed/28788551
http://dx.doi.org/10.3390/ma7031984
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