TY - JOUR
T1 - Improvements of fabrication processes and enhancement of critical current densities in (Ba,K)Fe2As2 HIP wires and tapes
AU - Pyon, Sunseng
AU - Suwa, Takahiro
AU - Tamegai, Tsuyoshi
AU - Takano, Katsutoshi
AU - Kajitani, Hideki
AU - Koizumi, Norikiyo
AU - Awaji, Satoshi
AU - Zhou, Nan
AU - Shi, Zhixiang
N1 - Funding Information:
This work was partially supported by a Grant-in-Aid for Young Scientists (B) (16K17745), a Grant-in-Aid for Scientific Research (A) (17H01141), and the Japan-China Bilateral Joint Research Project by the Japan Society for the Promotion of Science (JSPS, the project number is 11611140101). This work was partially performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University (Project No16H0045). We thank Z Gao, K Togano and H Kumakura for fruitful discussions for improving the quality of the polycrystalline sample.
Publisher Copyright:
© 2018 IOP Publishing Ltd.
PY - 2018/4/13
Y1 - 2018/4/13
N2 - We fabricated (Ba,K)Fe2As2 superconducting wires and tapes using the powder-in-tube method and hot isostatic pressing (HIP). HIP wires and tapes showed a high value of transport critical current density (J c) exceeding 100 kAcm-2 at T = 4.2 K and the self-field. Transport J c in the HIP wire reached 38 kAcm-2 in a high magnetic field of 100 kOe. This value is almost twice larger than the previous highest value of J c among round wires using iron-based superconductors. Enhancement of J c in the wires and tapes was caused by improvement of the drawing process, which caused degradation of the core, formation of microcracks, weak links between grains, and random orientation of grains. Details of the effect of the improved fabrication processes on the J c are discussed.
AB - We fabricated (Ba,K)Fe2As2 superconducting wires and tapes using the powder-in-tube method and hot isostatic pressing (HIP). HIP wires and tapes showed a high value of transport critical current density (J c) exceeding 100 kAcm-2 at T = 4.2 K and the self-field. Transport J c in the HIP wire reached 38 kAcm-2 in a high magnetic field of 100 kOe. This value is almost twice larger than the previous highest value of J c among round wires using iron-based superconductors. Enhancement of J c in the wires and tapes was caused by improvement of the drawing process, which caused degradation of the core, formation of microcracks, weak links between grains, and random orientation of grains. Details of the effect of the improved fabrication processes on the J c are discussed.
KW - (Ba,K)FeAs
KW - critical current density
KW - hot isostatic pressing (HIP)
KW - powder-intube (PIT)
KW - superconducting wires and tapes
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U2 - 10.1088/1361-6668/aab8c3
DO - 10.1088/1361-6668/aab8c3
M3 - Article
AN - SCOPUS:85045836424
SN - 0953-2048
VL - 31
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
IS - 5
M1 - 055016
ER -