Enhanced critical current density in K-doped Ba122 polycrystalline bulk superconductors via fast densification

iScience

Yuta Hasegawa¹  Yusuke Shimada²  Shinnosuke Tokuta²  Akiyasu Yamamoto³ 

[1] Corresponding author;Department of Applied Physics, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan;IMR, Tohoku University, Sendai 980-8577, Japan;

关键词: Condensed matter physics;    Superconductivity;    Transport property of condensed matter;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: Iron-based superconductors are expected to be used in strong magnet applications owing to their excellent superconducting properties. The process of sintering a mechanically alloyed precursor powder is effective in achieving a high upper critical field and critical current density in BaFe2As2 (Ba122) polycrystalline bulk materials. However, when this process is applied to K-doped Ba122, which shows the highest critical temperature in the Ba122 family, suppressing the vaporization of potassium is challenging. In this study, spark plasma sintering (SPS) method was applied to K-doped Ba122 to achieve fast densification. In contrast to the conventional synthesis method, which requires several tens of hours, optimally K-doped bulks with near theoretical density were obtained after only 5 min of SPS, and the magnetic critical current density reached 105 A/cm2 at 5 K. The demonstrated superconducting properties suggest that this fast densification technique is a useful tool for applying K-doped Ba122 to bulk trapped field magnets.

【 授权许可】

Unknown