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Pulsed laser deposition of Fe-oxypnictides : Co- and F-substitution
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Haindl, Silvia, Sato, Michiko, Wurmehl, Sabine, Büchner, Bernd and Kampert, Erik (2020) Pulsed laser deposition of Fe-oxypnictides : Co- and F-substitution. Superconductor Science and Technology, 33 (10). 105004. doi:10.1088/1361-6668/ababea ISSN 0953-2048.
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WRAP-Pulsed-laser-deposition-Fe-oxypnictides-Co-F-substitution-Kampert-2020.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (2269Kb) | Preview |
Official URL: http://dx.doi.org/10.1088/1361-6668/ababea
Abstract
The majority of thin film studies that were devoted to Fe-oxyarsenides has focused so far on F-substituted (i. e. indirectly electron doped) \textit{Ln}OFeAs (\textit{Ln} = La, Nd, Sm). Here we turn our attention towards Co-substituted (i. e. directly electron doped) LaOFeAs and SmOFeAs in order to investigate its growth on different substrate materials by using pulsed laser deposition (PLD). We detected dominant \textit{Ln}OFeAs phase formation and discuss the occurrence of minor impurity phases in the different films on different substrates. The lack of a superconducting transition in \textit{Ln}OFe$_{0.85}$Co$_{0.15}$As films on MgO(100) could be due to strain, since we observe an onset of superconductivity in SmOFe$_{1-x}$Co$_x$As ($x$ = 0.07, 0.15) films on other oxide substrates. In addition, Co-substitution (i.e. within the Fe$_2$As$_2$ layers) and F-substitution (i.e. within the \textit{Ln}$_2$O$_2$ layers) leading to direct and indirect electron doping respectively, appears for films deposited on CaF$_2$ substrates. In contrast to the F-substituted but Co-free Fe-oxyarsenides, the co-doped SmO$_{1-x}$F$_x$Fe$_{0.85}$Co$_{0.15}$As film has experimentally accessible upper critical fields down to the lowest temperatures and may serve as an ideal test bed for further theoretical modeling of Fe-oxyarsenides.
Item Type: | Journal Article | ||||||||||||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Thin films , Laser beams -- Industrial applications, Superconductivity, Molecular beam epitaxy | ||||||||||||||||||
Journal or Publication Title: | Superconductor Science and Technology | ||||||||||||||||||
Publisher: | Institute of Physics Publishing Ltd. | ||||||||||||||||||
ISSN: | 0953-2048 | ||||||||||||||||||
Official Date: | 21 August 2020 | ||||||||||||||||||
Dates: |
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Volume: | 33 | ||||||||||||||||||
Number: | 10 | ||||||||||||||||||
Article Number: | 105004 | ||||||||||||||||||
DOI: | 10.1088/1361-6668/ababea | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
Date of first compliant deposit: | 5 August 2020 | ||||||||||||||||||
Date of first compliant Open Access: | 3 August 2021 | ||||||||||||||||||
RIOXX Funder/Project Grant: |
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