Publication Date:
2014-10-31
Description:
Highly textured NdFeAs(O,F) thin films have been grown on ion beam assisted deposition-MgO/Y 2 O 3 /Hastelloy substrates by molecular beam epitaxy. The oxypnictide coated conductors showed a superconducting transition temperature ( T c ) of 43 K with a self-field critical current density ( J c ) of 7.0 × 10 4 A / cm 2 at 5 K, more than 20 times higher than powder-in-tube processed SmFeAs(O,F) wires. Albeit higher T c as well as better crystalline quality than Co-doped BaFe 2 As 2 coated conductors, in-field J c of NdFeAs(O,F) was lower than that of Co-doped BaFe 2 As 2 . These results suggest that grain boundaries in oxypnictides reduce J c significantly compared to that in Co-doped BaFe 2 As 2 and, hence biaxial texture is necessary for high J c.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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