[10p-A31-1~16] 11.2 Wires, Bulks, Fabrication process, Power applications

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[10p-A31-11] Magnetic-field hysteresis of the critical current and flux pinning properties in iron-based superconductor (Ba,Na)Fe₂As₂ round wires

〇Ryosuke Sakagami¹, Tsuyoshi Tamegai², Junyi Luo¹, Yuji Tsuchiya¹, Satoshi Awaji¹ (1.IMR, Tohoku Univ., 2.ISSP, The Univ. of Tokyo)

Keywords:

superconductor,superconducting wire,critical current

The 122-type iron-based superconductors (IBSs) exhibit relatively high superconducting transition temperature and upper critical field, with values of 38 K and ~70 T, respectively, and superconducting round wires based on these materials are expected to be used in high-field applications not only at liquid He temperature but also at liquid H₂ temperature. In this study, the critical current (I_c) of Cu/Ag-sheathed (Ba,Na)Fe₂As₂ round wires processed by hot isostatic pressing (HIP) was measured at 4.2–25 K and 0–18 T during field-increasing and field-decreasing processes, and their magnetic-field hysteresis and flux-pinning properties were evaluated. In the low-field region, I_c hysteresis was observed between the field-increasing and field-decreasing processes.