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25 April 2024

» arxiv » 1410.8743

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Highly textured oxypnictide superconducting thin films on metal substrates
Kazumasa Iida ; Fritz Kurth ; Masashi Chihara ; Naoki Sumiya ; Vadim Grinenko ; Ataru Ichinose ; Ichiro Tsukada ; Jens Hänisch ; Vladimir Matias ; Takafumi Hatano ; Bernhard Holzapfel ; Hiroshi Ikuta ;
Date:	31 Oct 2014
Abstract:	Highly textured NdFeAs(O,F) thin films have been grown on ion beam assisted deposition (IBAD)-MgO/Y2O3/Hastelloy substrates by molecular beam epitaxy. The oxypnictide coated conductors showed a superconducting transition temperature (Tc) of 43 K with a self-field critical current density (Jc) of 7.0 x 104 A/cm2 at 5 K, more than 20 times higher than powder-in-tube processed SmFeAs(O,F) wires. Albeit higher Tc as well as better crystalline quality than Co-doped BaFe2As2 coated conductors, in-field Jc of NdFeAs(O,F) was lower than that of Co-doped BaFe2As2. These results suggest that grain boundaries in oxypnictides reduce Jc significantly compared to that in Co-doped BaFe2As2 and, hence biaxial texture is necessary for high Jc.
Source:	arXiv, 1410.8743
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