2008/05/15 by Xianping Zhang, Yanwei Ma, Zhaoshun Gao +4
Engineering · Physics and Astronomy · #Ball mill #Critical current #Doping #Electrical conductor #Grain boundary #High-temperature superconductivity #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1063/1.2936917
published as JAP 103,103915 (2008) · 18 pages, 5 figures
openalex publication_date 2008/05/15 · arxiv created 2008/06/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
By utilizing C60 as a viable alternative dopant, we demonstrate a simple and industrially scalable route that yields a 10∼15-fold improvement in the in-high-field current densities of MgB2 tape conductors. For example, a Jc value higher than 4×104 A/cm2 (4.2 K, 10 T), which exceeds that for NbTi superconductor, can be realized on the C60 doped MgB2 tapes. It is worth noting that this value is even higher than that fabricated using strict high energy ball milling technique under Ar atmosphere. At 20 K, Hirr was ∼10 T for C60 doped MgB2 tapes. A large amount of nanometer-sized precipitates and grain boundaries were found in MgB2 matrix. The special physical and chemical characteristics of C60, in addition to its C containing intrinsic essence, are a key point in enhancing the superconducting performance of MgB2 tapes.