[6a-PB1-1~46] 11 Superconductivity（Poster）

[6a-PB1-8] Upper critical fields and critical current densities characteristics of Nb₃Sn doped with fourth element

〇(M2)Yuya Tanabe¹, Tomohiro Yonenaka¹, Rina Yonezuka¹, Kiuchi Masaru¹, Edmund Soji Otabe¹, Teruo Matsushita¹, Yoshiyuki Monju², Taiji Mizuta², Kyoji Tachikawa^3,4, Kozo Osamura⁵ (1.Kyushu Inst. of Tech., 2.Osaka Alloying Works, 3.NIMS, 4.Tokai Univ., 5.RIAS)

Keywords:Nb3Sn, critical current density, upper critical field

It is well known that the small amount of Titanium (Ti) addition to the bronze significantly increases the growth rate of the Nb₃Sn layer. Futhermore, this addition improves the critical current density J_c and the upper critical field B_c2 due to the.refinement of crystal grains and the reduction of coherence length. On the other hand, the addition of Tantalum (Ta), Gallium (Ga) and Hafnium (Hf) also improves B_c2, the addition of Magnesium (Mg) or Germanium (Ge) improves pin force density F_p, the addition of Hf increases the growth rate of the Nb₃Sn layer. Therefore, in order to develop a new Nb₃Sn material having further high characteristics, it is necessary to clarify what kind of element or combination is effective.
In this study, B_c2 and J_c characteristics were measured by adding elements Mg, Hf, Ge, Ga, and Ta to bronze for Nb₃Sn, and the influence of the fourth element addition on these properties was investigated.