Present status of PIT round wires of 122-type iron-based superconductors

[摘要] Outstanding characteristics with high Tcand Hc2and small anisotropy in iron-based superconductors (IBSs) have triggered the development of superconducting wires and tapes using these novel superconductors. In this short article, developments and present status of round wires of 122-type IBSs are reviewed. By introducing hot-isostatic pressing (HIP) technique, Jcin round wires of 122-type IBSs has been improved significantly. Further improvements have been realized by refining the fabrication process of the core material and introducing partial texturing of the wire core. The largest transport Jcfor round wires at 4.2 K at self-field and 100 kOe are 2.0x105A/cm2and 3.8x104A/cm2, respectively. We also compare the Jccharacteristics of wires and tapes processed by HIP.

[发布机构] Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo; 113-8656, Japan^1;Naka Fusion Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 801-1 Mukoyama, Naka-shi, Ibaraki; 311-0193, Japan^2;High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai; 980-8577, Japan^3

[关键词] Core material;Fabrication process;Novel superconductor;Present status;Round wires;Transport Jc;Wire cores;Wires and tapes