Enhancement of Critical Current Density and Flux Pinning in Acetone and La2O3 Codoped MgB2 Tapes  

作　　者：高召顺 马衍伟 王栋樑 张现平 淡路智 渡边和雄 

机构地区：[1]Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, P.O. Box 2703, Beijing 100190 [2]High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

出　　处：《Chinese Physics Letters》2010年第11期166-168,共3页中国物理快报（英文版）

基　　金：Supported by the Beijing Municipal Natural Science Foundation under Grant No 2102045, the National Natural Science Foundation of China under Grant No 50802093, and the National Basic Research Program of China under Grant No 2011CB605905.

摘　　要：MgB2 tape samples with simultaneous additions of acetone and La2O3 were prepared by an in？situ processed powder-in-tube method. Compared to the pure and single doped tapes, both transport Jc and fluxing pinning are greatly improved by acetone and La2O3 codoping. Acetone supplies carbon into the MgB2 crystal lattice and increases the upper critical field, while the La2O3 reacts with B to form LaB6 nanoparticles as effective flux pining centers. The improvement of the superconducting properties in codoped tapes can be attributed to the combined effects of improvement in Hc2 and flux pinning.MgB2 tape samples with simultaneous additions of acetone and La2O3 were prepared by an in？situ processed powder-in-tube method. Compared to the pure and single doped tapes, both transport Jc and fluxing pinning are greatly improved by acetone and La2O3 codoping. Acetone supplies carbon into the MgB2 crystal lattice and increases the upper critical field, while the La2O3 reacts with B to form LaB6 nanoparticles as effective flux pining centers. The improvement of the superconducting properties in codoped tapes can be attributed to the combined effects of improvement in Hc2 and flux pinning.

关 键 词：SUPERCONDUCTIVITY 

分 类 号：TM26[一般工业技术—材料科学与工程] O511[电气工程—电工理论与新技术]