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Highly textured oxypnictide superconducting thin films on metal substrates

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arxiv 1410.8743 v1 pith:YIELQLIN submitted 2014-10-31 cond-mat.supr-con

Highly textured oxypnictide superconducting thin films on metal substrates

Kazumasa Iida , Fritz Kurth , Masashi Chihara , Naoki Sumiya , Vadim Grinenko , Ataru Ichinose , Ichiro Tsukada , Jens H\"anisch
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Vladimir Matias Takafumi Hatano Bernhard Holzapfel Hiroshi Ikuta
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classification cond-mat.supr-con
keywords bafe2as2co-dopedbeamcoatedconductorsfilmshigherhighly
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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.

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