TY - JOUR
T1 - Fabrication of small superconducting coils using (Ba,A)Fe2As2(A: Na, K) round wires with large critical current densities
AU - Pyon, Sunseng
AU - Mori, Haruto
AU - Tamegai, Tsuyoshi
AU - Awaji, Satoshi
AU - Kito, Hijiri
AU - Ishida, Shigeyuki
AU - Yoshida, Yoshiyuki
AU - Kajitani, Hideki
AU - Koizumi, Norikiyo
N1 - Publisher Copyright:
© 2021 IOP Publishing Ltd.
PY - 2021/10
Y1 - 2021/10
N2 - We report the fabrication of small (Ba,A)Fe2As2 (A: Na, K) coils using 10 m-class long round wires, fabricated by the powder-in-tube method. Coils are sintered using the hot-isostatic-press technique after glass-fiber insulations are installed. Critical current (I c) 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 (J c) and I c in (Ba,Na)Fe2As2 wires picked up from the coil reach 54 kA cm-2 and 51.8 A at T = 4.2 K under a magnetic field of 100 kOe, respectively. This value exceeds transport J c 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 J c.
AB - We report the fabrication of small (Ba,A)Fe2As2 (A: Na, K) coils using 10 m-class long round wires, fabricated by the powder-in-tube method. Coils are sintered using the hot-isostatic-press technique after glass-fiber insulations are installed. Critical current (I c) 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 (J c) and I c in (Ba,Na)Fe2As2 wires picked up from the coil reach 54 kA cm-2 and 51.8 A at T = 4.2 K under a magnetic field of 100 kOe, respectively. This value exceeds transport J c 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 J c.
KW - (Ba,K)FeAs
KW - (Ba,Na)FeAs
KW - HIP round wires
KW - critical current
KW - critical current density
KW - iron-based superconductor
KW - superconducting coil
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U2 - 10.1088/1361-6668/ac0cca
DO - 10.1088/1361-6668/ac0cca
M3 - Article
AN - SCOPUS:85115223090
VL - 34
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 10
M1 - 105008
ER -