SNF Issue No. 43, February 2018

In this Issue:

  • Event HIghlights

  • Science and Technology Highlights

    Selected Plenary & Invited Presentations

    Selected Invited Presentation

Robust High Je RE-Ba-Cu-O Symmetric Tape Round (STAR) Wire for Accelerator Magnets

Superior Performance of Iron-based Superconductors

He Huang, Chao Yao, Chiheng Dong, Xianping Zhang, Dongliang Wang, Shifa Liu, Zhe Cheng, Yanchang Zhu, Yanwei Ma

By using a powder-in-tube method combined with hot pressing procedures, Yanwei Ma’s group from the Institute of Electrical Engineering of CAS at Beijing could further increase the transport Jc  to 1.5 × 105 A/cm2 (Ic = 437 A) at 4.2 K and 10 T in Ba1-xKxFe2As2 tapes. The transport Jc measured at 4.2 K under a high magnetic field of 27 T is still on the level of 5.5 × 104 A/cm2 and at 20 K and 5 T is as high as 5.4 ×104 A/cm2. These Jc  values are the highest ever reported for iron-based superconducting wires and tapes. The reasons of such high transport Jc achieved in the Ba1-xKxFe2As2 tapes are the high degree c-axis texture and the relatively small and uniformly distributed grains of the superconducting cores. In addition, the Jc values were also measured at different magnetic field directions, the anisotropy of tapes at 4.2 K and 10 T is 1.37, a value which is much smaller than that of the Bi-2223 and YBCO tapes. These results further strengthen the position of iron-based superconductors as a competitor to other superconductors in high field applications. Read More

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