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Fabrication of small superconducting coils using (Ba,A)Fe2As2 (A: Na, K) round wires with large critical current densities

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arxiv 2106.10612 v1 pith:IDHRLOLK submitted 2021-06-20 cond-mat.supr-con

Sunseng Pyon , Haruto Mori , Tsuyoshi Tamegai , Satoshi Awaji , Hijiri Kito , Shigeyuki Ishida , Yoshiyuki Yoshida , Hideki Kajitani
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Norikiyo Koizumi
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classification cond-mat.supr-con
keywords fe2as2wirescoilcoilscriticalcurrentroundfabrication
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We report the fabrication of small (Ba,A)Fe2As2 (A: Na, K) coils using 10 m-class long round wires, fabricated by powder-in-tube (PIT) method. Coils are sintered using hot-isostatic-press (HIP) technique after glass-fiber insulations are installed. Critical current (Ic) of the whole coil using (Ba,Na)Fe2As2 and (Ba,K)Fe2As2 are 60 A and 66 A under the self-field, and the generated magnetic fields at the center of the coil reach 2.6 kOe and 2.5 kOe, respectively. Furthermore, the largest transport critical current density (Jc) and Ic in (Ba,Na)Fe2As2 wires picked up from the coil reach 54 kAcm-2 and 51.8 A at T = 4.2 K under a magnetic field of 100 kOe, respectively. This value exceeds transport Jc of all previous iron-based superconducting round wires. Texturing of grains in the core of the wire due to the improvement of the wire drawing process plays a key role for the enhancement of Jc.

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