Effects of drawing and high-pressure sintering on the superconducting properties of (Ba,K)Fe2As2 powder-in-tube wires

The evolution of the superconducting properties of round wires of (Ba,K)Fe2As2 fabricated by the powder-in-tube (PIT) method is systematically studied. After establishing the method to obtain the largest transport critical current density (Jc) in round wires using the hot isostatic press technique,...

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Bibliographic Details
Published in:Superconductor science & technology 2015-11, Vol.28 (12)
Main Authors: Pyon, Sunseng, Yamasaki, Yuji, Kajitani, Hideki, Koizumi, Norikiyo, Tsuchiya, Yuji, Awaji, Satoshi, Watanabe, Kazuo, Tamegai, Tsuyoshi
Format: Article
Language:English
Subjects:
(Ba,K)Fe
critical current density
effects of drawing and sintering
hot isostatic pressing (HIP)
powder-in-tube (PIT)
superconducting wires
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Summary:The evolution of the superconducting properties of round wires of (Ba,K)Fe2As2 fabricated by the powder-in-tube (PIT) method is systematically studied. After establishing the method to obtain the largest transport critical current density (Jc) in round wires using the hot isostatic press technique, we investigated how the transition temperature (Tc), Jc, and microstructures change at each step of the wire fabrication. Unexpectedly, we find that superconducting properties of the wire core are significantly damaged by the drawing process. Systematic measurements of Jc and Tc of the core superconductor after each drawing and sintering process clarified the evolution of degradation by the drawing process and recovery by heat treatment.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/28/12/125014