Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity

Abstract Quantum materials such as antiferromagnets or superconductors are complex in that chemical, electronic, and spin phenomena at atomic scales can manifest in their collective properties. Although there are some clues for designing such materials, they remain mainly unpredictable. In this work...

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Autores principales:	L. Li, Q. Zheng, Q. Zou, S. Rajput, A. O. Ijaduola, Z. Wu, X. P. Wang, H. B. Cao, S. Somnath, S. Jesse, M. Chi, Z. Gai, D. Parker, A. S. Sefat
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7eaacf273d584a6098a277ebb033607a
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spelling	oai:doaj.org-article:7eaacf273d584a6098a277ebb033607a2021-12-02T16:06:30ZImproving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity10.1038/s41598-017-00984-12045-2322https://doaj.org/article/7eaacf273d584a6098a277ebb033607a2017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00984-1https://doaj.org/toc/2045-2322Abstract Quantum materials such as antiferromagnets or superconductors are complex in that chemical, electronic, and spin phenomena at atomic scales can manifest in their collective properties. Although there are some clues for designing such materials, they remain mainly unpredictable. In this work, we find that enhancement of transition temperatures in BaFe2As2-based crystals are caused by removing local-lattice strain and electronic-structure disorder by thermal annealing. While annealing improves Néel-ordering temperature in BaFe2As2 crystal (T N = 132 K to 136 K) by improving in-plane electronic defects and reducing overall a-lattice parameter, it increases superconducting-ordering temperature in optimally cobalt-doped BaFe2As2 crystal (T c = 23 to 25 K) by precipitating-out the cobalt dopants and giving larger overall a-lattice parameter. While annealing improves local chemical and electronic uniformity resulting in higher T N in the parent, it promotes nanoscale phase separation in the superconductor resulting in lower disparity and strong superconducting band gaps in the dominant crystal regions, which lead to both higher overall T c and critical-current-density, J c .L. LiQ. ZhengQ. ZouS. RajputA. O. IjaduolaZ. WuX. P. WangH. B. CaoS. SomnathS. JesseM. ChiZ. GaiD. ParkerA. S. SefatNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-14 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q L. Li Q. Zheng Q. Zou S. Rajput A. O. Ijaduola Z. Wu X. P. Wang H. B. Cao S. Somnath S. Jesse M. Chi Z. Gai D. Parker A. S. Sefat Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity
description	Abstract Quantum materials such as antiferromagnets or superconductors are complex in that chemical, electronic, and spin phenomena at atomic scales can manifest in their collective properties. Although there are some clues for designing such materials, they remain mainly unpredictable. In this work, we find that enhancement of transition temperatures in BaFe2As2-based crystals are caused by removing local-lattice strain and electronic-structure disorder by thermal annealing. While annealing improves Néel-ordering temperature in BaFe2As2 crystal (T N = 132 K to 136 K) by improving in-plane electronic defects and reducing overall a-lattice parameter, it increases superconducting-ordering temperature in optimally cobalt-doped BaFe2As2 crystal (T c = 23 to 25 K) by precipitating-out the cobalt dopants and giving larger overall a-lattice parameter. While annealing improves local chemical and electronic uniformity resulting in higher T N in the parent, it promotes nanoscale phase separation in the superconductor resulting in lower disparity and strong superconducting band gaps in the dominant crystal regions, which lead to both higher overall T c and critical-current-density, J c .
format	article
author	L. Li Q. Zheng Q. Zou S. Rajput A. O. Ijaduola Z. Wu X. P. Wang H. B. Cao S. Somnath S. Jesse M. Chi Z. Gai D. Parker A. S. Sefat
author_facet	L. Li Q. Zheng Q. Zou S. Rajput A. O. Ijaduola Z. Wu X. P. Wang H. B. Cao S. Somnath S. Jesse M. Chi Z. Gai D. Parker A. S. Sefat
author_sort	L. Li
title	Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity
title_short	Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity
title_full	Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity
title_fullStr	Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity
title_full_unstemmed	Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity
title_sort	improving superconductivity in bafe2as2-based crystals by cobalt clustering and electronic uniformity
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/7eaacf273d584a6098a277ebb033607a
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_version_	1718384971483185152

Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity

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